Solved: As studied, the average number of hours spent by senior high school students for their online classes a week is 25 hours with a standard deviation of 4 hours. Assuming that study is true and the data is normally distributed. Find the probability that a randomly selected senior high student spends more than 26 hours but less than 29 hours.

How many children belong to the upper 15% of the group?

suppose 100 refrigerator were manufactured during a day. ninety five operated perfectly and 5 had at least one defect. a sample of four is selected at random

Mr. Ybarola conducted an examination on his subject. He has determined that the mean score of all those who had taken the test is 89 and its standard deviation is 4. 1. Determine the 𝑧-score of Karlie who scored 94 in th…

A group of people were asked if they had run a red light in the last year. 302 responded “yes”, and 158 responded “no” find the probability that if a person is chosen at random, they have run a red light in the past year.

A shipment of five computer contains two that are slightly defective. If a retailer receive three of computers at random,list the elements of the sample paces using the letters D and N for defective and non-defective computers, respec…

a new brand of handbags comes in 5 different designs and each available in 4 different colors. If an outlet wishes to display these handbags with all the design and colors, how many handbags should be displayed

From a box containing 4 black balls and 2 green balls,3 balls are dawn in succession. Each ball is placed back in the box before the next draw is made. Let G be a random variable representing the number of green balls that occur. Find…

Mean height of 100 Students is 150 cms and the standard deviation is 15 cms. Assuming that the height are normally distributed, find how many students have height between 110 to 165 cms.

in a random sample of 120 teachers 48 of them have master's degree. find the value of p

Given W is a uniformly distributed random variable with mean 33 and variance 3. Using R programming, apply the suitable coding to identify answer in (a) and (b) (a) probability density function for W (b) cumulative distribution …

in a random sample of 120 teachers, 48 of them have master's degree find the value o p

1. A questionnaire asks shareholders of a company to state whether they consider the chairman’s salary to be too high, about right, or too low. Excluding shareholders who have no opinion, the probabilities of answers from randomly sel…

a meeting of consuls was attended by 4 Americans and 4 Germans. If three consuls were selected at random, construct the probability distribution of the random variable G representing the number of Germans.

a sample of 150 students were chosen at random from grade 11 students who have laptops.Pampanga. the sample indicated that 75% of them were in favor of having an educational trip. find a) 95% and b) 99% confidence intervals for the pr…

A shipments of five computers contains that are slightly defective. If a retailer receives three of these computers at random list the elements of the sample space 5 using the letters D and N for defective and non-defective computers …

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

Suppose a population is composed of only 3 measures: 1, 2, and 3. The possible samples of size 2 can be draw from this population. List all the possible sample size 2 when repetition allowed or with replacement.

Two cards are drawn from a deck. How many possible values can each of the following variables take? 5.) Number of times the first card is face card and the second card is not a face card

A certified public accountant (cpa) randomly selects 4 accounts for a group of 12 careful examination. The company being audited knows that 7 of the accounts contain - errors. what is the probability that all 3 accounts selected are e…

Given the data 6, 9, 12, 15, 16, 19, 22. Construct a sampling distribution of the sample mean without replacement and repetition by selecting 2 samples at a time.

Lending institutions normally publish their base lending rates in the print media. However, the actual lending rates vary from one lender to another. To estimate the mean lending rate, a financial a advisor takes a random sample of ni…

Let X be a ramdom variable with the following probability distribution x: 1, 2, 3, 4 P(X=x): 0.4, 0.3, 0.2, 0.1 a. Find E(X) and Var(X) b. is E(X) a possible value of X

Random sample of 400 men and 200 women is locality were whether they would like to have bus stop near their residence 200 men and 40 women are favor of proposal the test is there any significance diff b/w men and women at 5%.

An investigator thinks that people under the age of forty have vocabularies that are different than those of people over sixty years of age. The investigator administers a vocabulary test to a group of 31 younger subjects and to a g…

the result of a particular examination are given in the table below passed with distinction 10% passed without distinction 60% failed 30% it is known that a candidate fails in the examination if he obtains less than 40 marks while…

give me the answer of variance and standard deviation of P(3)=7/30 P(5)=1/3 and P(7)=13/30 by following the steps

Illustrate the probability distribution if X is the random variable that represent the number of recoveries

Fuel consumption tests are conducted for a particular model of car. If a 95% confidence interval with a margin of error of 0.6 kilometer per liter is desired, how many cars should be used in the test? Assume that a preliminary test in…

An inventor has developed a new, energy efficient lawn mower engine. He claims that the engine will run continuously for 5 hours (300 minutes) on a single gallon of regular gasoline. Suppose a simple random sample of 50 engines is tes…

You are thinking of using some leftover ceramic tiles to make a decorative border for a patio. You have ten blue, four gold, and six white tiles. In how many ways can you place the tiles to make the border if you need 12 tiles and y…

At Statsville High School, 125 students are taking university-preparation Science courses. Of these students, 64 take Biology, 40 take Chemistry, and 51 take Physics. There are 12 students who take both Chemistry and Physics, 11 who t…

There are 18 pieces of music to choose from: 6 for piano, 5 for violin, and 7 for guitar. In how many ways can you choose 3 pieces of music, if at least 1 must be for piano? Explain your reasoning. (3 marks)

In a National Achievement Test, suppose three test booklets are tested at random. Let D represent the defective test booklet and let N represent the non-defective test booklet. Let X be the random variable representing the number of n…

A meeting of consuls was attended by 4 Americans and 2 Germans. If three consuls were selected at random, construct the probability distribution of the random variable G representing the number of Germans

In a certain Algebra 2 class of 30 students, 7 of them play basketball and 15 of them play baseball. There are 10 students who play neither sport. What is the probability that a student chosen randomly from the class plays basketball …

How can I draw a normal curve with a mean of 60 and a standard deviation 12?

1. A recent study reported that an estimated 70% of professionals in IT have considered moving to U.S to earn a higher salary. The report further stated that this estimate is considered accurate within three percentage points, and c…

A random sample of size 4 is taken with replacement from a population with mean 12 and variance 8.Determine the mean ,variance,and standard deviation.

Gillbert got a new job in a shoe store. The number of pairs of shoes he was able to sell for three days are 2, 4, and 5. Assume that samples of size 2 are randomly selected with replacement from this population of three values. a. Li…

The results of the nationwide aptitude test in mathematics are normally distributed with mean=63 and standard deviation =5 . What is the 97.5th percentile?

A certain book manufacturing company presents the time it takes for sheets from a press to be folded, gathered, sewn, tipped on end sheets, and bound. The following data represent samples of books of two book production …

Find the 99th percentile of a normal curve

A Researcher surveyed 80 randomly selected Certified Public Accountants in each of the cities in Metro Manila area and asked them if they have performed work for free for 10 0r fewer clients in the last year. The results are shown in …

On the 3rd quarter examination in Statistics, the population mean was 70 and the population standard deviation was 9. Determine the standard score of a student who got a score of 88 assuming that the scores are normally distributed.

Find the 90th percentile of the normal curve

a. Determine the number of sets of all possible random samples that can be drawn from the given population by using formula,nCn,where N is the population size and n is the sample size.write your solutions in the box below.

On the 3rd quarter examination in Statistics, the population mean was 70 and the population standard deviation was 9. Determine the standard score of a student who got a score of 88 assuming that the scores are normally distributed.

A pair of fair dice is rolled. Let X be the random variable representing the sum of the numbers that appear. a. Construct the probability distribution of X for a pair of dice. b. Find P (X≥ 8). c…

A population consists of the values (1,3,5,7) consider a sample size of two that can be drawn from this population

Suppose a population consists of the numbers 2,3,5,8 and 12. What is the mean of the population? (Clue: Point Estimation)

1. Let X be a random variable that denotes the number of passengers in a train station for a given hour. What are the possible values of X?

Find the t_a/2 value for a 95% confidence interval when the sample size is 22.

examples of Functions (Continuity and inverse of a function),

In an intelligence test administered on 1000 children, the average was 60 and the standard deviation was 20. Assuming that the marks obtained by the children follow a normal distributed, find the number of children who have scored (i)…

a populatpion of 1,000 students has an average weekly allowance of =350 and standard deviation of =56.13 .what is the probability that a random sample of size =30 will have an average weekly allowance between 335 and 360?

Find the number of ways in which the word "BREAD' can be arranged when i) B and D take end places ii) E is placed in middle iii) vowels E and A always come together iv) vowels E and A never come togeth…

Let X be the random variable such that : P(X = –2) = P(X = –1), P(X = 2) = P(X = 1) and P(X > 0) = P(X < 0) = P(X = 0). Obtain the probability mass function of X and its distribution functions

A company study of product preferences of 10,000 consumers is as follows: products A. B and C were liked by 5015, 3464 and 4827 consumers, respectively. All the three products were liked by 500 consumers. Products A and B were liked b…

The lifetime of an electrical component normally distributed with mean 800 hrs and standard deviation of 60 hrs. What is the probability that the component will fail before 680hrs If standard deviation remain 60 hrs what would have …

Between z = 0 and z = 1.36

assuming that Huawei produces 5% of their total production of smartphones are defective. If 10 items are to be chosen at random from the production line, what then is the probability that; a. all smartphones are not defective? b…

How many scores are above 116?

The lifetime of a certain kind of bulb has a normal distribution with mean of 500 hours and standard deviation of 45 hours Find the percentage of bulbs with a lifetime of at least 570 hrs The percentage of bulbs with lifetime in bet…

Y10with usual OLS assumptions. Derive the expression for the error variance.

Making a sale on a customer call is 0.16 What’s the probability no sales will be made in 12 calls

Supposed three coins are tossed. Let X be the random variable representing the number of heads occur. Construct a table that shows the sample space and values of the random variable X.

Explain the following: • Probability Sampling and Non-Probability Sampling • Systematic sampling and Cluster Sampling • Advantages of Probability Sampling over Non-probability Sampling • Census vs. sample • Primary and Secondar…

A report says that 80% of India’s females aged 15-59 are not currently engaged in the workforce. A national agency has an opinion that this percentage may be even more. To validate its opinion, the agency did a survey of randoml…

What is regression analysis? Explain steps of performing regression analysis in detail? The following data shows the yearly sales (in million Rs.) of A2Zcorporation for the last nine years. Develop a regression model. Year 2011,…

Four balls are drawn in succession without replacement from an urn containing 4 white balls and 7 black balls. Let W be the random variable representing the number of white balls.

Use the given probability distribution table to answer each item. X 0 1 2 3 4 5 P(X) 0.10 0.24 0.08 0.20 0.21 0.17 1. P(2)= 2.P(greater than 0)= 3.P(less than 5)= 4.P(even)= 5.P(odd)= 6.P(between 0 and 5)= …

solve for the proportion of the area of the following probability notations then sketch the normal curve shading the required region of each given notation 1. P (-2 < z <1) 2. P (z > 3) 3. P (z < -2) 4. P (z > -1…

A committee of 5 members is to be formed from a group of 8 men and 5 women professionals. Let Y denote the number of women in the committee. If the selection is done randomly, determine the probability mass function of Y. What is the …

A population consists of the four numbers 1,2,8 and 9.List all the possible samples of size n=2 which can be drawn without replacement from the population.Find the following

. A population consists of the four numbers 1, 2, 8, and 9. List all the possible samples of size n = 2 which can be drawn without replacement from the population. Find the following: a. Population mean …

THE PROBABILITIES THAT A SURGEON OPERATES ON 3,4,5,6 or patients in any one day are 0.15,0.20,0.25,0.20 and 0.20 respectively

(a) The following table shows the number of units produced each month and the total incurred. MONTH UNITS COST JUNE 200 50,000 JULY 500 75,000 AUGUST 300 55,000 SEPTEMBER 800 95,000 OCTOBER 700 80,000 NOVERMBER 600 80,000 DECEM…

In a certain city, the daily consumption of electric power, X (in millions of kilowatt hours) is a random variable where X ~ Gamma (α, β) with a mean of 6 and a variance of 12. i) Find α and β. ii) Given a month has 30 days, how many …

supposed 100 refrigerator were manufactured during a day. ninety five operated perfectly and 5 had atleast one defect. a sample of four is selected at random. using the hypergeometric distribution formula, find the probability that 8 …

In an expirement where you roll a die and the random variable (X) is numbers that appears is even. What are the possible values of your random variable? 1 point

He wants to know how to identify the regions under the normal curve corresponding to different standard normal values. Your friend will send a picture of a normal curve with the corresponding area, and he asks you favor to explain eac…

Between z = 2.12 and z = -2.12

explain why the following experiments are not binomial. A. Rolling a die until a 6 appears. B. Asking 20 people how old they are. C. Drawing 5 cards from a deck for a poker hand.

Observe yourself in a day. find out how many Hours you spend in the following activities: House chores answering learning modules,Planting/Gardening, Using Social media,listening to music,watching television,and sleeping. Record your …

There are hundreds of apples on the trees, so you randomly choose just 45 apples and get a mean weight of 89.05 grams with a standard deviation of 4.43 grams. Assuming that the weight of the apples is normally distributed, what is the…

A new sneaker claims that it can make male athletes jump higher. A sample of 54 male athletes were asked to jump once with their own sneakers on and once wearing the new sneakers. The average jump increased by 0.98 inches with the new…

A random sample of 14 cigarettes of a certain brand has an average nicotine content of 3.7 milligrams and a standard deviation of 1.5 milligrams. What is the standard error of the 99% confidence interval for the average nicotine conte…

A random sample of 14 cigarettes of a certain brand has an average nicotine content of 4.4 milligrams and a standard deviation of 1.9 milligrams. What is the margin of error of the 99% confidence interval for the average nicotine cont…

A pair of fair dice is rolled. Let X the random variable representing the sum of the numbers that appear.Find P(3 ≤X≤ 10)

A box contains 4 yellow (Y) and 8 Pink balls. Six balls will be selected in the box. Determine the values of random variable P representing the number of pink balls.

3. The mean salary of ten employees is Php 32,000, and the median is Php 30,000. The highest-paid employee gets a Php 5,000 raise. a. What is the new mean salary of the ten employees? b. What is the new medi…

Four coins are tossed.Let T be the random variable representing the number of tails that occur.find the values of the random variable T

A random sample of 14 cigarettes of a certain brand has an average nicotine content of 3.8 milligrams and a standard deviation of 2 milligrams. What is the upper bound of the 99% confidence interval for the average nicotine content of…

Which of the following sampling method would be least likely to produce accurate and representative samples? a. Cluster Sampling b. Simple Random Sampling c. Systematic Sampling d. Snowball Sampling

A random sample of 14 cigarettes of a certain brand has an average nicotine content of 3.9 milligrams and a standard deviation of 2.5 milligrams. What is the lower bound of the 99% confidence interval for the average nicotine content …

Give at least 5 reasons why samples are used instead of population when conducting a research.

QUESTION ONE The manufacturer of product Gero requires three distinct processes A-C. On completion the product was passed from process C to finished goods stock. The following information was obtained in respect of the product 5,000…

The probability that an American industry will locate in Shanghai China is 0.70, in Beijing is 0.40 and in either Shanghai or Beijing or both is 0.80. what is the probability that the industry will locate : a) in both cities, b) in ne…

Calculate the width of the class with boundaries 5 and 30.

What is the probability or 4 out of 5 hands (dealer plus 4 players) receiving a "blackjack" (an Ace plus any 10 value card) all at the same time assuming all 104 cards are in play? Thank you

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