# random

4,731 results, page 22-
## Statistics

In a particular suburb 30% of housholds have installed electronic security systems. If 2 households are chosen at random from this area, what is the probability that neither has installed a security system? Using the binomial probability function for this

*asked by Jason L on February 26, 2007* -
## MAths

A unit square is drawn in the Cartesian plane with vertices at (0,0),(0,1),(1,0),(1,1). Two points P,Q are chosen uniformly at random, P from the boundary of the square and Q from the interior of the square. The line L1 through P and Q is drawn. The

*asked by ianian on April 29, 2013* -
## Probability

Let X,Y,Z be three independent (i.e. mutually independent) random variables, each uniformly distributed on the interval [0,1]. 1. Find the mean and variance of 1/(Z+1). E[1/(Z+1)]= var(1/(Z+1))= 2. Find the mean of XY/(Z+1). Hint: Use your answer to the

*asked by Anonymous on December 20, 2018* -
## Math

I don't remember sampling methods... i do know that there are three and one of them is litteraly called 'random'. if i can please be reminded of the methods i can finish the last 3 problems of my math.... i don't like math especially if you have a field

*asked by Iva on April 10, 2012* -
## stat.

The average age of a vehicle registered in the United States is 8 years, or 96 months. Assume the standard deviation is 16 months. If a random sample of a group of 48 vehicles is selected find the probability that the mean of the group’s age is between

*asked by chris on March 17, 2013* -
## probability

When you enter the bank, you find that there are only two tellers, both busy serving other customers, and that there are no other customers in queue. Assume that the service times for you and for each of the customers being served are independent

*asked by Chris on November 27, 2018* -
## Maths

From experience, Mr Subbu has found that the low bid on a construction job can be regarded as a random variable having the uniform density f(x)= 0.75C 2C/3

*asked by Nithi on August 19, 2014* -
## Business Statistics

A firm claims that only 10% of it's accounts receivables are over 30 days past due. The bank that supplies working capital or interim loans to the firms is suspect of the figure and accordingly takes a random sample of 100 accounts of the firm. Find the

*asked by Leo Elvis on March 16, 2015* -
## Probability and Statistics

The major would like to estimate the mean number of automobile crashes per day at the intersection of 2 highways. A random sample of 40 days worth of data had a mean of 4.3 crashes and a standard deviation of 0.9. How large of a sample would be needed in

*asked by Kim on April 30, 2012* -
## statistics

Suppose the average weight for population of men is 178 pounds. You draw a random sample of 10 men and record the following weights: 150, 145, 180, 200, 175, 190, 142, 175, 240, 150. Calculate the sampling error.

*asked by Bob on October 28, 2016* -
## business stats

Given the following information about a hypothesis test of the difference between two means based on independent random samples, which one of the following is the correct rejection region at a significance level of .05? Assume that the samples are obtained

*asked by jenny on June 23, 2011* -
## Finite Math

At Sally's Salads, there is an all you can eat salad bar. You may choose one of 3 different lettuces, any number of 11 vegetable toppings, and at most one of 6 dressings. Suppose a salad is made at random following those rules. If the salad includes a

*asked by Josh on December 10, 2015* -
## math

You draw one card at random from a shuffled deck of 52 playing cards. The deck has four 13−card suits (diamonds, hearts, clubs, spades). The card is a club or a spade. Find the probability of this event. Write each answer as a fraction in simplest form,

*asked by PleaseHelpCheckMyAnswers on March 23, 2016* -
## statistics

A random sample of n= 16 scores is selected from a normal distribution with a mean of u=50 and a standard deviation of q=10. A. what is th probability that the sample mean will have a value between 45 and 55? B. What is the probability that a sample mean

*asked by Zelinka on May 4, 2011* -
## math

Suppose a jar contains 5 red marbles and 33 blue marbles. If you reach in the jar and pull out 2 marbles at random without replacement, find the probability that both are red.

*asked by Aaron on April 22, 2010* -
## math

The lifetime of a SuperTough AAA battery is normally distributed with mean of 28.5 hours and standard deviation of 5.3 hours. For a battery selected at random, what is the probability that the lifetime will be 34 hours or less?

*asked by Sav on November 27, 2012* -
## Math

A box containing 20 yellow balls, 9 red balls and 6 blue balls. If the balls are selected at random, what is the smallest number of balls that need to be selected so you will select at least two balls of each colour

*asked by Baby girl on May 4, 2014* -
## Probability

A customer at Cavallaro's Fruit Stand picks a sample of 4 oranges at random from a crate containing 50 oranges, of which 4 are rotten. What is the probability that the sample contains 1 or more rotten oranges?

*asked by Bobbie on December 7, 2016* -
## Statistics

Hello Can you help me It is reported that 72% of working women use computers at work , choose 4 working wonen at random . Find the probability that : A : all 4 use a computer at their work B : at least one does not use a computer at work Please help me

*asked by Rehab on December 9, 2014* -
## Probability

A customer at Cavallaro’s Fruit Stand picks a sample of 3 oranges at random from a crate containing 60 oranges, of which 4 are rotten. What is the probability that the sample contains 1 or more rotten oranges?

*asked by Brandon on July 23, 2016* -
## probability

The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a defective calculator is 10%. If 15 calculators are selected at random, what is the probability that 4 or more of the calculators will be defective

*asked by Anonymous on July 23, 2012* -
## Basic Mathematics

A bag contains 2 red balls, 3 blue balls and 5 green balls. 3 balls are drawn at random. Find the probability that a) the 3 balls are of different colours b) 2 balls are of the same colour c) all the 3 are of the same colour.

*asked by Shammi on May 23, 2014* -
## statistics

1. A random sample of n = 16 scores is selected from a normal distribution with a mean of µ = 50 and a standard deviation of á = 10. What is the probability that the sample mean will have a value between 45 and 55? What is the probability that the sample

*asked by jansa on May 5, 2011* -
## Math please help

According to a study conducted by a statistical organization, the proportion of americans who are satisfied with the way things are going in their lives is 0.82. Suppose that a random sample of 105 Americans is obtained. (Please answer the below and round

*asked by LADO on December 3, 2014* -
## Statistics

You are a buyer bidding on a lot of 10,000 uncut diamonds. You select 100 stones at random, sight unseen, from the lot. The average weight is 0.98 ct with a standard deviation in the sample of 0.11 ct. What is the 95% confidence interval for the average

*asked by Fran on March 4, 2010* -
## Lincoln College Of New En

A survey by Men’s Health magazine stated that 14% of men said they used exercise to reduce stress. Use a = 0.10. a random sample of 100 men was selected and 10 said that they used exercise to relieve stress. Use the P –value method to test the claim.

*asked by Paula on April 26, 2013* -
## math probability question

If a player rolls 2 dice and gets a sum of 3 or 11 he collects $15. if he gets a sum of 12 he gets $3. the cost to play the game is $2. let x be the net money gained by the player. a. construct the prob distribution of the random variable x b. find the

*asked by lily on October 14, 2015* -
## math

A bag contains 5 red balls and 7 green balls . A ball is picked at random , its color is noted and it is given out . The bag is shaken and a second selection is made. A. Draw. Tree diagram to illustrate thr information. B. Calculate the probability that

*asked by Natasha on April 25, 2013* -
## math

A random digit dialing phone survey asked, how many of the last ten traffic lights you drove through were red. Of 880 respondents, 171 admitted at least one light had been red. What is likely direction of the bias: More or fewer than 171 really ran a red

*asked by anonymous on March 31, 2013* -
## hard probability question

four different written driving tests are administered by the MVD. on of these four tests is selected at random for each applicant for a drivers test. if a group consisting of two women and three men apply for a license, what is the probability that a.

*asked by justin on February 24, 2009* -
## Statisics

35%of adult Americans are regular voters. A random sample of 250 adults in a medium-size college town were surveyed, and it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidence and comment on your

*asked by tina on October 6, 2011* -
## maths

99. From a box containing 5 black marbles,8 pink marbles, 6 white marbles, and 5 yellow marbles, Kim removed 4 marbles,one of which was black.If she removes one more marble at random,what is the probability that it will be black? a. 1/6 b. 4/21 c. 1/5 d.

*asked by thomas on October 10, 2014* -
## Math Help

According to statistics gathered as part of a research project by a group of statistics students on the college campus, 376 out of the 439 deaths attributed to lightning strikes were male. If all of the names of the deceased were placed into a drum and one

*asked by Jamie on September 22, 2011* -
## statistics

Let x be a random variable that represents the length of time it takes a student to complete a take-home exam in Dr. Larson’s psychology class. After interviewing many students, it was found that x has an approximately normal distribution with mean µ =

*asked by Anonymous on November 16, 2011* -
## Math ---HELP!!!!!

One hundred people are selected at random and tested for colorblindness to determine whether gender and colorblindness are independent. The following counts were observed. Colorblind Not Colorblind Total Male 7 53 60 Female 1 39 40 Total 8 92 100 Find the

*asked by angela on June 15, 2016* -
## Math 120

The table shows the distribution, by age, of a random sample of 3990 moviegoers ages 12-74. If one moviegoer is randomly selected from this population, find the probability, expressed as a simplified fraction, that the moviegoer is not in

*asked by Beth on March 19, 2017* -
## Math 120

The table shows the distribution, by age, of a random sample of 3990 moviegoers ages 12-74. If one moviegoer is randomly selected from this population, find the probability, expressed as a simplified fraction, that the moviegoer is not in

*asked by Jessica on March 26, 2017* -
## Statistics

a Rollercoaster's auditors estimate that the average daily loss from those illegally riding without tickets is at lease (greater or equal) $295, but wants to determine the accuracy of this statistic. The company researcher takes a random sample of losses

*asked by Robert on November 1, 2014* -
## Quantitative Analysis

To make meaningful causal inferences when conducting quantitative analyses, one must employ...? A. Dummy coding when using regression models B. Parametric methods of analysis robust in relationship to violation of basic assumptions C. T-Tests and Analysis

*asked by Stacie on November 7, 2013* -
## Math

Given any random, 3-digit number, what is the probability that a number will be: a) a multiple of 5 b) a multiple of 2 c) a square number How?

*asked by Tiara on December 3, 2010* -
## statistic

1.The state highway patrol stops every 5th car on highway 210 to check drivers' licenses and registrations. Which sampling technique are they using? systematic sampling -chose this one convenience sampling cluster sampling simple random sampling stratified

*asked by bria on July 13, 2012* -
## math

The tread life of a particular tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 2000 miles. What is the probability that a randomly selected tire of this brand will last longer than

*asked by Madison on September 18, 2010* -
## statistics

A card is to be chosen at random from a shuffled deck. Find the probability that the card drawn is a)the queen of clubs, given that it is an honor card. (I think it is a typo) b) a red four, given that the face number is even. c) a seven, given that the

*asked by Anonymous on November 7, 2007* -
## Statistics

When testing H0: σ12 = σ22 vs. Ha: σ12 ≠ σ22 two random samples of sizes 10 and 8, respectively, are used. The calculated value of the test statistic is found to be equal to 2.22. Which of the following statements is true? a. H0 must be rejected at

*asked by Melanie on November 14, 2012* -
## Algebra

The time a group of high school students arrive home from school each day was found to be normally distributed. The mean time was 3:15pm and the times had a standard deviation of 15 minutes. What is the probability that a student chosen at random arrives

*asked by Jon on March 5, 2008* -
## statistics

the quality control inspector of a production plant will reflect a batch of syringes if two or more defectives syringes are found in a random sample of ten syringes taken from the batch of two percent defective syringes.what is the probability that the

*asked by gaio on December 8, 2010* -
## stats

This past summer the LifeSaving Society did a survey about who was at risk in the water, with the goal of reducing swimming accidents. (Globe and Mail July 15 2010) Consider a similar study done that shows that 96 % of those born in Canada can swim but

*asked by az on October 2, 2010* -
## bio 12

you have an orginal populatonof eagles, then humans introduce new eagles in the same area. the new eagles reduce the amountof resources in its home range. what type ofdistrubtion would give the most accuarte assesment of sustainable maximum popualtion. the

*asked by kelly on September 13, 2011* -
## random assignment-stats

Would this correctly result in random assignment? A researcher assigns students to one of three conditions based on the month of their birth. If they were born in January, April, July, or October, they are assigned to condition A. February, May, August,

*asked by ash on March 2, 2009* -
## random assignment-stats

Would this correctly result in random assignment? 1. A researcher assigns students to one of three conditions based on the month of their birth. If they were born in January, April, July, or October, they are assigned to condition A. February, May, August,

*asked by ash on March 2, 2009* -
## Probability

Erin's CD changer holds 6 compact disks. Justin uses the random function on to play all the songs randomly. If each of the disks on the changer holds 10 songs, what is the probability has favorite song will be first? If I am getting the hang of this, it's

*asked by Ktowns on March 31, 2008* -
## Math

Voting In a survey of 350 registered voters in belair,123 said that they would vote for the democratic candidate for mayor. if registered voter is selected at random, what is the probability that this person will vote for the democratic candidate.

*asked by Daine on May 18, 2015* -
## psychology

Random assignment can be described as a research method: used to balance the independent and dependent variables. no longer used because of its unpredictability. increasing the likelihood that the experimental group and control group will be different.

*asked by cindy on October 31, 2010* -
## 6th grade math

We are learning probability and can you please check my answer. Question: Enrique has 3 dimes, 2 quarters, and 5 nickels in his pocket. He takes one coin from his pocket at random. What is the probability that the coin is either a dime or a nickel? My

*asked by Kathy on March 22, 2009* -
## psychology

Random assignment can be described as a research method: used to balance the independent and dependent variables. no longer used because of its unpredictability. increasing the likelihood that the experimental group and control group will be different.

*asked by cindy on October 30, 2010* -
## math

at a grand opening of a store, every 3rd person is given a balloon, and every 7th person is given a $5 coupon. if a person is selected at random from the first 100 people to shop there, whats the probability that the person will be given a balloon and a

*asked by peter on June 28, 2010* -
## statistics

A random sample of 20 hogs on farmer Brown's hog farm had an average weight of 350 pounds and a SD of 70 pounds. Find 95% confidence interval estimate of the mean weight of all farmer Brown's pigs.

*asked by Lacey on December 9, 2010* -
## statistics

A company has four production sections viz., S1, S2, S3 and S4 which contribute 30%, 20%, 28% and 22% of the total output. It was observed that those sections respectively produced 1%, 2%, 3% and 4% defective units. If a unit is selected at random and

*asked by Harry on February 4, 2015* -
## Stats

A car rental agency currently has 43 cars available, 27 of which have a GPS navigation system. Two cars are selected at random from these 43 cars. Find the probability that both of these cars have GPS navigation systems. Round to four decimal places.

*asked by Anonymous on October 21, 2013* -
## Statistics

There are 100 questions from a SAT test, and they are all multiple choice with possible answers of a,b,c,d,e for each question only one answer is correct. Find the mean number of correct answers for those who make random guesses for all 100 questions?

*asked by Karen on February 13, 2014* -
## math

1) If 9 and 12 each divide Q without remainder, which of the following must Q divide without remainder? A)1 B)3 C)36 D)72 E)The answer can't be determined from the given info ^I got B 2) If mn does not equal 0, then 1/n^2 times (m^5n^3/m^3)^2 A)mn^4

*asked by Aline on February 11, 2018* -
## statistics

A simple random sample of 1350 registered voters shows that 58% favor Candidate A over Candidate B. Construct a 99% confidence interval for the percent of the population of all registered voters who prefer Candidate A over Candidate B.

*asked by justin on May 13, 2015* -
## Check Answer!! math

A test was given to a group of students. The grades and gender are summarized below A B C Total Male 7 14 11 32 Female 15 13 16 44 Total 22 27 27 76 If one student is chosen at random from those who took the test, Find the probability that the student was

*asked by Anonymous on December 10, 2016* -
## statistics

The average teenager spends 7.5 hours per week playing computer and video games. In a random sample of 110 teenagers, what is the probability that their mean time for playing games is more than 8 hours per week?

*asked by ron on November 2, 2011* -
## Statistics

a. In a random sample of 500 observations , we found the proportion of successes to be 48%. Estimate with 95% confidence the population proportion of successes. B. Repeat part (a) with N=200 C. Repeat part (a) with N=1000 I need to know how to do this in

*asked by Christie on July 18, 2012* -
## Algebra, Probability needed ASAP

1: A box contains 95 pink rubber bands and 90 brown rubber bands. You select a rubber band at random from the box. Find each probability. Write the probability as a fraction in simplest form. A). Find the theoretical probability of selecting a pink rubber

*asked by ~NeedsABetterSchool~ on May 15, 2017* -
## statistics

Help me! Population of heights of college students is approximately normally distributed with a mean of 64.37 inches and standard deviation of 6.26 inches A random sample of 74 heights is obtained. Find the mean and standard error of the x bar distribution

*asked by anon on November 7, 2011* -
## Elementary Statistics

There are 100 questions from an SAT test, and they are all multiple choice with possible answers of a,b,c,d,e. For each question, only one answer is correct, find the standard deviation for the numbers of correct answers for those who make random guesses

*asked by Confused on April 11, 2014* -
## statistics

Lubbock, Texas ran a survey and determined that 27% of all households subscribed to the daily paper, 32% watched the evening news, and 9% did both. If a household is chosen at random, what is the probability that the evening paper was received or the news

*asked by Kate on September 15, 2011* -
## Geometry

A bag contains five pieces pf paper wit hthe emasures of various angles. The angle measures are 23,35,23,41,113. Suppose you pick 3 pieces of paper from the bag at random. What is the probability you can form an isosceles triangle with the three angles?

*asked by Lisa on July 24, 2011* -
## math

A factory finds out that on the average 20% of bolts produced by the given machine will be defective.if 10 bolts are selected at random from the day's production of this machine,find the probability that 1.exactly 2 will be defective. (this question is

*asked by farahan on March 26, 2016* -
## MAth

A popular restaurant downtown says that 15% of diners order the daily special. Consider a random sample of 108 people who dined at the restaurant. What is the probability that the proportion of diners who ordered the special differs from the population

*asked by RC on October 30, 2018* -
## statistics

A transportation company wants to estimate the variance of the length of time goods are in transit across the country. A random sample of 20 shipments gives days and day. Give a 95% confidence interval for the variance of the transit time for all goods.

*asked by ak on May 17, 2010* -
## statistics

Assume that we collect a large (n>30) simple random sample of annual incomes of adults in the United States. Because the sample is large, can we approximate the distribution of those incomes with a normal distribution ? Why or why not?

*asked by Anonymous on March 6, 2013* -
## statistics

One student is selected at random from a student body. Suppose the probability that this student is female is 0.5 and the probability that this student works part time is 0.6. Are the two events "female" and "working" mutually exclusive?

*asked by nasta on October 6, 2010* -
## statistics

The frequency of color blindness in the Caucasian American male population is about 8%. If a random sample of 125 individuals is chosen from this population, what is the probability that 5-10 individuals in the sample are color blind?

*asked by Cheryl on March 21, 2013* -
## Math

A committee of 100 Democrats is formed with 22 members from the East, 38 members from the Midwest, and 40 members from the West. If a random sample of 3 members from this committee is selected, what is the probability to the nearest percent that all 3 are

*asked by Ashleigh on February 12, 2015* -
## statistics

A simple random sample of a size n is drawn from a population that is normally distributed. The sample mean, x is found to be 110, and the sample standard deviation, s, is found to be 10. A- Construct a 95% confidence interval about u if the sample size,

*asked by Anonymous on March 29, 2015* -
## math

A magazine claims that 25% of its readers are college students. Of a random sample of 200 readers, 42 are college students. Use a .10 level of significance to test Ho: p =.25 and H1: p ≠ .25 Show the hypothesis test procedure.

*asked by cristi on September 14, 2010* -
## statistics

Please help. I have no idea what I am doing Use the standard normal (z score) table to find: P(-1.00 ≤ z) & Find the probability that a data value picked at random from a normal population will have a standard score (z) that lies between the following

*asked by sharon on December 29, 2017* -
## Math

The standard deviation of test scores on a certain achievement test Is 11.3. If a random sample of 81 students had a sample score of 74.6 , find a 90% confidence interval estimate for the average score of all students.

*asked by Rami on August 20, 2014* -
## math

A nationwide survey showed that 65% of all children in the U.S. dislike eating vegetables. If three children are chosen at random, what is the probability that all three dislike eating vegetables? Write as a percent to the nearest tenth.

*asked by Miki on May 13, 2014* -
## Statistics

Assume that men constitute 49% of population in a country. Assume also that among men there are 5% of color-blinded. Find the proba- bility that a person chosen at random is a color-blinded man.

*asked by Erica on November 14, 2008* -
## statitics

a light bulb manufacture gaurentees that the mean life of a certain type of bulb is at least 875 hours. A random sample of 40 light bulbs has a mean life of 863 hours with a standard deviation of 50. a=0.04

*asked by jamie on April 18, 2011* -
## math

an insurance company reported that 55% of all automobile damage claims were made by people under age 25. If six automobile damage claims were selected at random, determine the probility that exactly four of them were made by someone under ager 25.

*asked by EJ on May 17, 2014* -
## math

A bag contains x marbles. Half of the marbles are blue. Four less than the number of blue marbles are red. The remaining marbles are purple. What is the probability of choosing a purple marble at random? a. 2 b. 4 c. 1/2-(x/2-4)/x d. x/2-4 e. x/2 please

*asked by Tomas on October 25, 2013* -
## statistics

A store owner receives 12 computers:nine are model A and the rest are model B.if two computers are sold at random,find the probability that one of each model is sold.

*asked by farahan on March 25, 2016* -
## statistics

company A has 110 employed, company B has 750 employed and company C has 250 employed. Compute the probability that an employee selected at random comes from company A or B.

*asked by iris on June 7, 2014* -
## Statistics

In a survey, 55% of the voters support a particular referendum. If 30 voters are chosen at random, find the standard deviation of the number of voters who support the referendum.

*asked by Jim on October 14, 2013* -
## Math 😢😢😢😢😢 Help

Suppose a jar contains 5 red marbles and 33 blue marbles. If you reach in the jar and pull out 2 marbles at random, find the probability that both are red.

*asked by Adam on October 2, 2016* -
## word problem?

In a random survey, 8 out of 18 students Would rather go to an amusement park than to the zoo. In a group of 225 students, how many students can you expect to prefer the amusement park?

*asked by nonononono on June 3, 2014* -
## Math

You have six $1 bills, eight $5 bills, two $10 bills, and four$20 dollar bills in your wallet. You select a bill at random. Without replacing the bill, you choose a second bill. What is P($1, then $10)? A. 77/190 B. 3/100 C.3/95 D.2/5

*asked by SchoolHelpNeeded on May 7, 2014* -
## Math

A teacher is collecting data about students. Which of the following is a random sample. A.Students known by the teacher B.Students not known by the teacher C.Students using the library at lunch D.None of the answers are correct

*asked by Anonymous on June 25, 2015* -
## math

A store owner receives 12 computers:nine are model A and the rest are model B.if two computers are sold at random,find the probability that one of each model is sold

*asked by farahan on March 26, 2016* -
## Math

If a class has a population where 5% of the students have red hair and 12% have blonde hair, what's the probability that if we select one student at random that they'll have either red or blonde hair?

*asked by Deborah on March 17, 2016* -
## Math

A game has 30 cards numbered 1 through 30. e cards are shu ed. one card is picked at random. Find each probability. Which cards would give a probability of 1/10 they were picked.

*asked by Amy on November 3, 2017* -
## statistics

A bag contains 7 red marbles, 2 blue marbles, and 1 green marble. If a marble is selected at random, what is the probability of choosing a marble that is not blue?

*asked by uos on March 10, 2017* -
## Math

Suppose an urn contains 8 red,5 white and 7 blue marbles.a.If 3 marbles are drawn at random from the urn with replacement,what is the probability that three marbles are red?

*asked by Leonard on November 15, 2013* -
## Math

A box contains 6 yellow, 5 violet & 3 pink chips. If 3 chips are tobe selected in random, what is the probability that the chips are composed of 2 violet or 1 pink?

*asked by Anonymous on November 5, 2017* -
## math

in his left pocket ralph has 4 quarters and 5 nickels. in his right pocket he has 3 quarters 2 nickels and 1 penny. if he wants to select a quarter at random, which pocket should he choose?

*asked by Celeste on March 21, 2012*