Solved: 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 been the mean to ensure that not more than 10% of the components fail before 800hrs.

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…

Nicole Nelson has come into an inheritance from her grandparents. She is attempting to decide among several investment alternatives. The return after one year is dependent primarily on the interest rate during the next year. The rate …

Raphael’s grades in his statistics classes are as follows: Quizzes: 62, 88, 82 Laboratories: 89, 96 Examinations: 87, 99 a. In this class, quizzes count once, laboratories count twice as much as a quiz, and examinations count three ti…

Combination A bag of contains 4 yellow, 8 red and 3 blue balls. How many ways can 3 balls be selected so that the following conditions are met? a. all balls are yellow b. all balls are red c. There is one ball from each co…

Given 𝑥 ̅ = 62 and s = 8. Find the z-score value that corresponds to each of the following scores up to two decimal places. X=70 X=78 X=82 X=50 X=42

How many grams (to the nearest five) are in nine and three eights of an ounce?

A researcher claims that the average wind speed in a certain city is 8 miles per hour. A sample of 32 days has an average wind speed of 8.2 miles per hour. The standard deviation of the population is 0.6 mile per hour. At α = 0.05, is…

A survey found that the average hotel room rate in New Orleans is $88.42 and the average room rate in Phoenix is $80.61. Assume that the data were obtained from two samples of 50 hotels each and that the standard deviations of the pop…

The result of nationwide aptitude test in mathematics are normally distributed with m=80 and s= 15 what is the percentile rank of a score of 84

construct the probability histogram

A card is drawn from a deck of 20 cards (all the cards numbered 1 to 5 in a standard check) and the random variable W gives the number on the card. Construct the probability mass function and its corresponding histogram.

1. A school organized a fundraising activity for its donations to victims of a recent typhoon. It involves selling 1000 raffle tickets. One ticket costs $100. The lone winner of this raffle will receive free tuition worth $30,00. What…

9 boys and 2 girls are to be placed next to each other in the school ground for morning assembly. What is the probability that there are exactly 4 boys between the 2 girls?

The chance that a student will clear the quiz-1 paper is 0.59 and the chance that he will clear both quiz-1 and quiz-2 papers is 0.17. The chance that he will clear at least one quiz paper is 0.74. What is the chance that he will clea…

Pramod goes to a shop to buy some clothes. Shopkeeper shows him 5 shirts, 6 pants and 13 t-shirts. If he selects three clothes at random, then find the probability that, randomly chosen clothes does not contain pant.

1. A school organized a fundraising activity for its donations to victims of a recent typhoon. It involves selling 1000 raffle tickets. One ticket costs $100. The lone winner of this raffle will receive free tuition worth $30,00. What…

There are a total of 180 students who are part of badminton, table tennis and tennis team of the college. Of which 70% of students play table tennis, 10% play tennis and 60% play badminton. It is also noticed that all students who pla…

A person predicts daily whether the price of stocks of wrist watch companies will go up or down. If his prediction on stock price of Titan is correct 4 times out of 8, for Rolex it is correct 2 times out of 4 and for Fossil it is corr…

In a Multiple Select Question, there are 5 options of which one or more can be correct. Let us define an event E that the option ‘A’ is correct. What is the cardinality of E?

The probability of getting a sum divisible by three if a pair of fair dice is rolled and the numbers that turn up are noted.

9 boys and 2 girls are to be placed next to each other in the school ground for morning assembly. What is the probability that there are exactly 4 boys between the 2 girls?

The probability of getting at most two heads when three coins are tossed simultaneously.

whenever horses a,b and c race together , their respective probabilities of winning are 0.3, 0.5 and 0.2. they race three times . (a) Find the probability that the same horse wins all three races . (b) Find the probability that a,b,…

Oranges chosen at random have a mean mass of 210 grams and a standard deviation of 35 grams. Assuming a normal distribution, what's the probability of choosing an orange with a mass between 170 grams and 250 grams?

Monthly food expenditures for families in Caloocan City average Php 4 500 with a standard deviation of Php 750. Assuming that the monthly food expenditures are normally distributed, what percentages of the expenditures are between Php…

The probability of getting at most two heads when three coins are tossed simultaneously.

Let T be a random variable giving the number of heads plus the number of tails in three tosses of a coin. List the elements of the sample space for the three tosses of the coin and assign a value to each sample point.

What is the probability that the height of a student picked at random has a height greater than 116 cm

Make a study about how many sheets of paper you consumed weekly in answering your self learning modules record the quantity total number of sheets per subject then construct a probability distribution compute the mean variance and the…

X=82

Two balls are drawn in succession without replacement from an urn containing 4 red balls and 5 blue balls. Let R be the random variable representing the number of red balls. Find the values of the random variable R.

Random samples with size 4 are drawn from the population containing the values 14, 19, 26, 31, 48, and 53 a. Construct a sampling distribution of the sample means. b. Find the mean of the sample means. c. Compute the …

julia and tony play and game rock paper scissor assume that at each play they make their choices with equal probability 1/3 for each of the three moves and dependently of any previous play A.)on any single play,what is …

Find the probability distribution of a random variable X representing the outcome when a single die is rolled once. 2 Three cards are drawn in succession from a deck without replacement. Find the probability distribution for th…

Four coins are tossed. Let Z be the random variable representing the number of tails.

Supposed to laptops or tested . If we let x be the random variable representing the number of defective laptops . What are the possible values of the random variable ?

A basket contains 10 red balls and 4 white balls.If three balls are taken from the basket one after the other,determine the possible values of the random variable R representing the number of red balls.

In a box are 2-balls one white and one yellow. Two balls are picked one at a time with replacement. Let X be the random variable representing the number of white balls.

Three balls are drawn in succession without replacement from an urn containing 3 red balls, 2 blue balls and 2 yellow balls. Let Z be the random variable representing the number of blue balls. Sample space (all outcomes) P…

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…

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

what is the factor given that the size of the population is 500 and samples of size 50 are drawn from this population

Complete the table below. Experiment 1. Number of rings before the phone is answered 2. Teacher ask the students to finish the test after an hour 3. Number of complaints per day 4. Height of the tallest building in Lucena City 5…

A basket contains 8 ripe and 6 unripe bananas. If three bananas are taken from the basket one after the other. Construct a table that shows all the possible outcomes of the random experiment and all the values of the random variable R…

Two balls are drawn in succession without replacement from a box containing 5 red balls and 6 blue balls. Let Z be the random variable representing the number of blue balls. Find the values of the random variable Z.

In a challenging chess game, the probability that Mr.B will win is 0.67. Assume that the chess competition follows a binomial distribution and 7 separate matches will be played. Determine: (a) will win at most 3 matches (b) wi…

Let T be a random variable giving the number of heads plus the number of tails in three tosses of a coin. List the elements of the sample space for the three tosses of the coin and assign a value to each sample point.

Suppose three coins are toosed let y be the random variables representing the number of heads that occur. A. Find the values of the random variables Y. Complete the table below.

A pair of fair dice is rolled. Let X 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. Find P(X≤ 7) D. Find t…

Given W is a uniformly distributed random variable with mean 33 and variance 3. determine: (a) probability density function for W (b) cumulative distribution function for W

A.classify the following random variables as discrete or continuous. 1.The weight of the professional wrestlers

Given the μ=65 and σ=5 of a population of Math Exam scores. The z−value that corresponds to a score of X=74 is

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 t…

Two balls are drawn in succession without replacement from a box containing 3 red balls and 4 yellow balls. Find the possible outcomes and the values X of the random variable X, where X is the number of yellow balls. Use R for red bal…

Given the data: 123, 126, 129, 132, and (a) construct a sampling of the mean (b) draw a histgyfor the sample means

Permutation: 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? …

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 t…

Mrs. Balao is randomly choosing 3 students for a team who will compete in a math quiz bee, and there are 5 girls and 8 boys to choose from. What is the probability of having a team made up 2 girls and a boy?

An experiment consists of asking three Grade 10 students at random if they prefer to choose the Academic track or TVL track in the senior high school. Use A for Academic and T for TVL. Let Y represent the random variable representing …

A study was conducted to determine the average salary of a teacher. With this, 81 teachers were invited as samples. It was known that the mean salary of these sample teachers is Php 24,000.00 with a standard deviation of Php 1,000.00.…

An experiment consists of asking three Grade 10 students at random if they prefer to choose the Academic track or TVL track in the senior high school. Use A for Academic and T for TVL. Let Y represent the random variable representing …

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 …

How many children have heights between 98 cm and 104 cm?

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 41 male athletes were asked to jump once with their own sneakers on and once wearing the new sneakers. The average jump increased by 1.28 inches with the new…

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…

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