Solved: Suppose Billy scored a 54 on his exam. The mean of the grade is 66 and the standard deviation is 3.what is the z score?

A presidential candidate asks a polling organization to conduct a nationwide survey to determine the percentage of potential voters who would vote for him over his rival presidential candidate. Out of 2 500 respondents, 915 said that …

11. Find z if the standard normal-curve area a) between 0 and z is 0.4726; b) to the left of z is 0.9868; c) to the left of z is 0.3085; d) between -z and z is 0.9282 12. If a random variable has…

The number of taxis waiting at a cab stand is thought to follow a uniform distribution. The number present was recorded at 50 random times:Use the appropriate goodness of fit test to determine if the uniform distribution is a good ch…

Construct a probability distribution table if we let X the random variable be the number of boys in the family with 3 children.

The variance of the number of cars sold per day is 2.27 what is the Standard deviation of the cars per day?

Nikbakht has received an email from an unknown mailer offering an entry into a lottery. For a price, he can get a ticket that may pay a prize double the price. He buys 2 tickets. Unknown to him an unfair system determines a winner whe…

From the past experience of software quality testing, it is known that the probability of the presence of an error in coding is 0.05. If the probability of a tester detecting an error when the error is present is 0.78 and the probabil…

The local government is planning to give financial assistance to low income families in remote barangays due to COVID-19 crisis. To be successful in this endeavor, the mayor instructed his staff to conduct a survey in order to de…

A random sample of size 50 is drawn from binomial distribution with parameters n=100 and p=0.3. what is the probability that the sample mean is a)larger than 3.9 b) between 4.1 and 4.4 c) smaller than 4.0

A basket contains 10 ripe and 4 unripe bananas. If three bananas are taken from the basket one after the other, determine the possible values of the random variable U representing the number of unripe bananas

A simple random sample of 10 people from a certain population has a mean age of 27. Can we conclude that the mean age of the population is not 30? The variance is known to be 20.

The mean monthly sale of a particular household item in department stores was observed as 133.3 units per store. After an advertising campaign, data on sales of this item from 25 stores were collected and it is found that the mean sal…

A statistician is studying blood pressure levels of Italians in the age range 75-80. The following is some information about her study: The data were collected by responses to a survey conducted by email, and no measures …

1. Daily sales records for a car dealership show that it will sell 0, 1, 2, or 3 cars, with probabilities as listed: Number of Repairs(X) 0 1 2 3 p(x) 0.5 0.3 0.1 0.1 …

a factory is manufactures face masks that widely used during pandemic covid-19. it is found that on average, 10% of the face masks produced are defective. if 150 face masks are randomly selected, what is the probability that the numbe…

Assume that random guesses are made for seven multiple choice questions on an SAT test, so that there are n=7 trials, each with probability of success (correct) given by p=0.55. Find the indicated probability for the number of corr…

wenty samples each of size 10 were inspected. The number of defectives detected in each of them is given below: 0, 1, 0, 3, 9, 2, 0, 7, 0, , 1, 0, 0, 3, 1, 0, 0, 2, 1, 0 Find the control limits for the nu…

Determine the probability of drawing an even-numbered card or a card with a red suit from a standard deck of cards. Leave your answer in a reduced fraction.

True or False. (i) Age of a student is a discrete data. (ii) Mean is not affected by extreme values. (iii) A histogram can not be made for categorical data. (iv) ∑ 5 20 7 = 70. (v) The spread of a single value is always zero. (v…

construct the probability distribution of the random variable for the given situation. Two balanced diced are rolled. Let S be the random variable denoting the sum of the number of dots that will appear

An operation is carried out by a subsystem consisting of three units that operate in a series configuration. (a) The units have exponentially distributed lifetimes with mean 1. How many subsystems should be operated in parallel to a…

The officer's of the science club are planning to sell 125 tickets to be raffled during the school's foundation day . One ticket will win PHP 2,000 and the other tickets win nothing. If you buy one ticket, what will be your expected g…

if random variable is uniformly distributed (-2,1) find pdf of y = 2x ^3

Consider a population consisting of 5 units with the following values of a variable Y: 29, 87, 94, 10, 13. A simple random sample of size 3 is picked from this population without replacement. i. Write down all the possible simple rand…

Two coins are tossed. Let T be the number of tails that occurs. Determine the values of the random variable T. Three coins are tossed. Let T be the number of tails that occurs. Determine the values of the random variable T. A meeting …

Compute the probabilities using the standard normal curve P(-1.89 < z < 1.68)

2) Oranges are grown, picked, and then stored in warehouses in Tampa, Miami, and Fresno. These warehouses supply oranges to markets in New York, Philadelphia, Chicago, and Boston. The following table shows the shipping costs per truck…

A. Get 2 fruits 1. a. Select a fruit 1 piece at a time. Do all possible selections. b. Illustrate or describe each selection you made. c. Count the number of different selections you have made. 2. a. Select the fruits 2 pieces at …

1. 4 boys and 3 girls are to be seated in a row of 7 chairs. How many ways can it be done under the following conditions: a. boys stay together? b. girls stay together? c. boys and girls are seated alternately? 2. Permute the lett…

Lawrence performs a survey to determine the average number of minutes of exercise seventh-grade athletes get in one week. He gets a list of sports and the seventh-grade students participating in each sport. He then chooses 10 people f…

what is the probability that a market inspector will discover greater three violations of the public health code

The lifetime of bulbs produced by Tariqs lightening company follows a normal distribution with a mean of 3462 hours and a standard deviation 1070 hours. What is the probability that randomly selected bulb will have a lifetime of at mo…

Determine the area under the standard normal distribution curve between z=1.15 and z=-1.85

The brain volumes (centemeters cubed) of 20 brains have a mean of 1115.9 cm cubed and a standard deviation of 120.9 cm cubed. Use the given standard deviation and the range rule of thumb to identify the limits separating values that a…

Determine the area under the standard normal distribution curve between z=1.15 and z=-1.85

1) How do drivers react to sudden large increases in the price of gasoline? To help answer the question, a statistician recorded the speed of cars as they passed a large service station. He recorded the speeds (mph) in the same lo…

You open a checking account. You are paid 3% interest on the average balance but are charged a 7 monthly charge. Assuming that interest is paid monthly regardless of the number of days in the month, calculate the average daily balance…

The number of cars sold per day at a local car dealership, along with its corresponding probabilities, is shown in the table. Compute for the mean, variance, and standard deviation of the probability distribution of the random variabl…

Construct the probability distribution for each random variable X when The random variable X represents the amount gain by a person who buys s 20 peso ticket from a total of 1000 tickets for a raffle whose winner will obtain ₱5,000

Two balls are drawn in succession without replacement from an urn containing 9 yellow balls and 6 green balls. Let X X be the random variable representing the number of yellow balls. Question: How many possible outcomes are there in…

Twenty samples each of size 10 were inspected. The number of defectives detected in each of them is given below: 0, 1, 0, 3, 9, 2, 0, 7, 0, , 1, 0, 0, 3, 1, 0, 0, 2, 1, 0 Find the control limits for the number of defectives …

2. A roulette wheel is divided into 25 sectors of equal area numbered from 1 to 25. Find a formula for the probability distribution of X, the number that occurs when the wheel is spun

A laboratory supervision in Type III hospital is investigating a number of reported on-the-job training accidents related to needle stick injuries over a period of one month. Based on the past records, she has the following records on…

Construct the probability distribution for each random variable X. a. The random variable X represents the number of heads that occur when you toss 4 coins at the same time. b. The random variable X represents the number of …

Which of the following looks most like an F distribution? 1. T distribution. 2. F distribution 3. Normal distribution. 4. Another one.

The salary distribution ('000) of 1000 employees at a certain company is as follows: Salary (years) frequency 25-39 20 40-49 32 50-59 30 60-64 10 65-69 8 a, Construct the bar-chart of the data b, Construct the histogram of…

Consider estimating the mean of a variable drawn from a population with mean u and standard deviation o, using the following formulae: Ĥ1 = x1. X + x2 2 X1 + 2x2 X +x2 3 is = %3D Assume that in all cases the individual estimates x, ar…

Let Xl, "', X" be a random sample from the density where - B < thetha < B f(x; U) = e-(x-B) exp (_e-(X-B)), (a) Find a method-of-moments estimator of B. (b) Find a maximum-likelihood estimator of B

The lifetime of a light bulb is normally distributed with 800 hours and standard deviation 50 hours. A random light bulb is selected. What is the probability that it will last for more than 950 hours?

Stacy de Leon, a physics major, is a prolific writer and a math genius of this university. If it is known that Stacy's IQ belongs to the upper 1% of the learner population, what is her minimum IQ?

X = [0.01, 0.36, 0.97, 0.44, 0.86, 0.49, 0.02, 0.19, 0.54, 0.63, 0.69, 0.27, 0.21, 0.55, 0.54, 0.1 , 0.02, 0.49 , 0.42, 0.79], is a list of 20 random numbers generated from a pseudo-random number generator G. a. What is a uniformit…

There are three grades in a report card that you want to interpret in terms of performance: mathematics 75, english 85, and science 90. This means are 72,83 and 88, respectively. The standard deviation are 3, 10, and 15, respectively

In a class of 28 students, 16 play an instrument and 11 play a sport. There are 7 students who do not play an instrument or a sport. What is the probability that a student plays an instrument given that they play a sport?

If all of your computer data are stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that both drives will fail during a year?

In a class of 28 students, 16 play an instrument and 11 play a sport. There are 7 students who do not play an instrument or a sport. What is the probability that a student plays an instrument given that they play a sport?

In a railway yard goods trains arrive that at the rate of 30 trains per day. Assuming that the inter-arrival time follows an exponential distribution and the service time distribution is also exponential with an average of 36 mi…

1. Consider the random quantity X, with PDF fx(x) = {4/3(2x-x^2), 0

A shipment of five computers contains two that slightly defective. If a retailer receives three of these computers at random, list the elements of the sample space S using the letters D and N for defective and non-defective compute…

1. Each sample of water has a 10% chance of containing a particular organic pollutant. Assume that the samples are independent with regard to the presence of the pollutant. Let X =the number of samples that contain the pollutant in…

Construct a probability distribution for the data and draw a histogram for the following: The probabilities that a patient will have 0,1 ,2 , or 3 medical tests performed on entering a hospital are 6/15, 5/15, 3/15, and 1/15 respec…

1. The number of calls coming into a hotel’s reservation center averages three per minute. a. Find the probability that no calls will arrive in a given one-minute period. b. Find the probability that at least two calls will arrive…

The probability that aa new automobile has a backup camera is 0.6. The probability that a new automobile has a GPS system is 0.4. The probability that a new automobile has both a backup camera and GPS is 0.2. If a new automo…

1. The manufacturer of a certain kind of light bulb claims that the lifetime of the bulb in hours, X can be modeled as a random quantity with PDF. fx(x)= {0, x<100 c/x2, x>=100, where c is a constant. i. What…

Nine out of every 100 people in the Philippines have Type B positive blood. If 8 people are chosen at random, what is the probability that less than 3 people have Type B blood?

An achievement research was conducted to the Grade 10 students of Scott National High School. The researcher randomly selected twenty (20) Grade 10 students to take a diagnostic exam in Mathematics at the start of the school year. The…

A mean of 3 out of 5 students request for tomato sauce with their meal in a canteen. A random sample of 8 students is selected, what is the probability that less than 4 students request for tomato sauce with their meal?

In a study of the effects of early Alzheimer’s disease on nondeclarative memory, the Category Fluency Test to establish baseline persistence and semantic memory and language abilities. The eight subjects in the sample had Category Flu…

A researcher thinks that people under the age of twenty have vocabularies that are different than those of people over sixty years of age. Thus, to test this hypothesis, the researcher administers a vocabulary test to a group of 25 yo…

In the study of urinary tract infection, the sample and proportion in the group of fosfomycin / trometamol was 25, 0.92 and trimethoprim / sulfamethoxazole was 16, 0.61, respectively. a) Find the difference in proportions. (0.5) 4…

Use the normal distribution of heights of adult women, which has a mean of 165 centimeters and a standard deviation of 4 centimeters and the following table with the standard scores and percentiles for a normal distribution to find t…

The lifetime of bulbs produced by Tariqs lightening company follows a normal distribution with a mean of 3462 hours and a standard deviation 1070 hours. What is the probability that randomly selected bulb will have a lifetime of at mo…

If the diameters of ball bearings are normally distributed with mean 0.6140 inches and standard deviation 0.0025 inches, determine the percentage of ball bearings with diameters, (a) between 0.610 and 0.618 inches inclusive (b) greate…

A random of 200 school managers were administered a developed leadership skill test. The sample mean and standard deviation were 78 and 4.2 respectively. In the standardization of test, the mean was 73 and the standard deviation was 8…

A principal at a certain school claims that the students in his school are above average intelligence. A random sample of thirty students IQ scores have a mean score of 112.5. Is there sufficient evidence to support the principal’s cl…

& A survey will be conducted on the use of social media among senior high school students. a. How large a sample must be obtained if the researchers want to be 95% confident that the error will not exceed 5%? …

The probability function of a discrete random variable X is as follows: Values of X: x -4 -2 0 2 4 P(x) k 2k 3k 5k 6k i) Find the value of k. ii) Find the probability of the value of X exactly one. iii) Find the probability of …

Four balls are drawn in succession without replacement from an urn containing 4 red balls, 3 blue balls and 3 yellow balls. Let Z be the random variable representing the number of blue balls.

In a betting game wherein the result may be one of the following in one turn: break even, win 5 peso or lose 3 peso. How much will be the amount a player gets after three turns. Let X be the total amount of a player gets after three t…

1.The curve between 0 and -2.0? 2.The curve to the right of 1.5

1. The mean life time of a sample of 16 fluorescent light bulbs produced by a company is computed to be 1570 hours. The population standard deviation is 120 hours. Suppose the hypothesized value for the population mean is 1600 hou…

An experimental study was conducted by a researcher to determine if a new time slot has an effect on the performance of pupils in mathematics. Fifteen randomly selected learners participated in the study. Toward the end of the investi…

A population consists of 500 values with mean 50 and variance 5 find mean and standard error of sampling distribution of means for sample size equal to 20 it sampling is done 1) Without replacement 2) With replacement

(a) The central limit theorem is perhaps the most important result in statistics. State and prove it. (b) The times spent by customers coming to a Kalingalinga Total gas station to fill up can be viewed as independent random variab…

Zaheeda scored 9 goals in 5 netball matches at this rate about how many goals will she score in 10 games?

Sally has 11 pairs of socks in her drawer. Each pair is a different color and design, but they are not together as pairs; they are just in her drawer scattered about. With her left hand, Sally reaches in and picks one sock. a. Wh…

2. An experiment consists of tossing a die and then flipping a coin once if the number on the die is even. If the number on the die is odd, the coin is flipped twice. Using the notation 4H, for example, to denote the outcome that the …

1. Daily sales records for a car dealership show that it will sell 0, 1, 2, or 3 cars, with probabilities as listed: Number of Repairs(X) 0 1 2 3 p(x) 0.5 0.3 0.1 0.1 a. Find the probability distribution …

(a) Suppose that 𝜃̂is an estimator for a parameter 𝜃 and 𝐸[𝜃̂] = 𝑎𝜃 + 𝑏 for some nonzero constant 𝑎 and 𝑏. (i) Determine the biasness of the estimator. (ii) Find a function of 𝜃̂, say 𝜃̂∗ that is an unbiased estimator for 𝜃. (b) Given…

If f(x,y)= { t(3x+y) 0 elsewhere 1

In a state, men have a mean height of 168cm, standard deviation 8cm, and women have a mean height of 160cm, standard deviation of 5cm. In a random sample of 100 married couples, the average height differences between husband and wife …

A population has mean=37 and s.d=2.If the distribution is transformed into a new distribution with mean =100 and s.d=20,what new values will be obtained for each of the following scores:35,36,37,38,39,?

It is known from the records of the city schools that the standard deviation of mathematics test score on the XYZ test is 5. A sample of 200 pupils were taken and it was found that the sample mean score is 75. Previous tests showed th…

A.) First sample has n=3 and M=8. Second sample has n=5 and M=6. What is the weighted mean? B.) First sample has n=10 and M=12. Second sample has n=4 and M=7. What is the weighted mean? Also do you mind showing me the formula how …

Let x be a random variable that denotes the number of passenger in a train station for a given hour. What are the possible values of x

A shipment of 25 similar laptop computers to a retail outlet contains 5 that are defective. If a school makes a random purchase of 3 of these computers, find the probability when the school accidentally purchased 1 defective and 2 are…

A family has four children. If x is a random variable that pertains to the number of female children, what are the possible values of x

A jar contains 5 red marbles, 5 white marbles, and 6 blue marbles. Two marbles are randomly selected from the jar with replacement. Find the following probabilities. Leave your answer as a reduced fraction.

One day, Professor brought a box that contains 6 yellow and 7 green marbles in his class in Statistics and Probability subject. He asked one student to draw three marbles, with replacement, in the box. What is the probability when the…

2) Find the expected value and variance of the number of heads obtained when 2 fair coins are tossed simultaneously. Also find (i) the median and mean deviation from median (ii) quartile deviation of the probability distribution…

Suppose Billy scored a 54 on his exam. The mean of the grade is 66 and the standard deviation is 3.what is the z score?

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Question ID: mtid-4-stid-47-sqid-4593-qpid-312