5,395 Answered Questions for the topic probability

Probability Statistics

04/13/21

confidence interval question
In an experiment to assess the effects on rats of exposure to cigarette smoke, 11 animals were exposed and 11 control animals were not exposed to smoke from unfiltered cigarettes. At the end of the... more
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Probability

04/12/21

What is the probability a student will get cold food from  Location A
In a particular day, if a  student eats in campus, 50% of the time will be in the  Location A, 30% of the time at the Location B, and 20% of the time at Location C. If he eats at the  Location A,... more
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Probability Statistics

04/12/21

Express the confidence interval 67.9 % ± 5.9 % in the form of a trilinear inequality.
Express the confidence interval 67.9%±5.9% in the form of a trilinear inequality._% <p< %_
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Probability Statistics

04/12/21

Assume that a sample is used to estimate a population proportion p. Find the 98% confidence interval for a sample of size 280 with 126 successes
Assume that a sample is used to estimate a population proportion p. Find the 98% confidence interval for a sample of size 280 with 126 successes. Enter your answer as an open-interval (i.e.,... more
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Probability Statistics

04/12/21

Assume that a sample is used to estimate a population proportion p. Find the 99.5% confidence interval for a sample of size 87 with 37.9% successes.
Assume that a sample is used to estimate a population proportion p. Find the 99.5% confidence interval for a sample of size 87 with 37.9% successes. Enter your answer as an open-interval (i.e.,... more
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Probability Statistics

04/12/21

How large of a sample size is required?
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p∗=27%. You would like to be 98% confident that... more
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Probability

04/11/21

Statistics and probability
a programmer plans to develop a new software system. in planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. how... more
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Probability

04/11/21

A person buys a single ticket, what will their expected net gain be?
A lottery consists of 5,000 tickets of $ 10 each. 4000 tickets only were sold and among them are: 300 tickets which bring 50 $ each; 200 tickets that bring $ 100 each and 100 tickets that bring $... more
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Probability Math Statistics Mean

04/10/21

Assume that z-scores are normally distributed with a mean of 0 and a standard deviation of 1. If P(−b<z<b)=0.273, find b.
And if possible, could you include the way you reached the answer?
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Probability

04/10/21

If I had to get a total of at least 18 from dice rolls, how do I figure out how many variations of dice rolls?

If I had to get a total of at least 18 from dice rolls, how do I figure out how many variations of dice rolls?
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Probability

04/10/21

Math probability

In a class of 28 students, 19 have a cat and 6 have a dog. There are 5 students who do not have a cat or a dog. What is the probability that a student who has a cat also has a dog?
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Probability Algebra 1

04/09/21

In a class of 30 students, 4 of them have caught the flu. If a teacher randomly selects 2 students, what is the probability that both of them do not have the flu?
In a class of 30 students, 4 of them have caught the flu. If a teacher randomly selects 2 students, what is the probability that both of them do not have the flu?
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Probability Algebra 1

04/09/21

A jar of coins contains 8 quarters, 6 dimes, and 10 pennies. If you randomly draw two coins, what is the probability of drawing two quarters?
A jar of coins contains 8 quarters, 6 dimes, and 10 pennies. If you randomly draw two coins, what is the probability of drawing two quarters?
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Probability Algebra 1

04/09/21

help! A bag of marbles contains 5 blue marbles, 3 green marbles, and 2 purple marbles. What is the probability of drawing a green marble, removing it, and then drawing a blue marble?
A bag of marbles contains 5 blue marbles, 3 green marbles, and 2 purple marbles. What is the probability of drawing a green marble, removing it, and then drawing a blue marble?
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Probability Algebra 1

04/09/21

Cindy owns 3 cats, 2 dogs, a rabbit, and 5 mice. If she randomly chooses the order to feed her pets, what is the probability that a cat will eat first and a dog will eat second?
Cindy owns 3 cats, 2 dogs, a rabbit, and 5 mice. If she randomly chooses the order to feed her pets, what is the probability that a cat will eat first and a dog will eat second?
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Probability Algebra 1

04/09/21

Algebra 1 Probability
In a group of 40 people, a fourth of them have black hair and a fifth of them have blonde hair. If 2 people are chosen at random from the group, what is the probability that the first will have... more
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Probability Algebra 1

04/09/21

Probability question
A refrigerator contains 10 bottles of water, 7 bottles of apple juice, and 13 bottles of orange juice. If 2 drinks are taken at random from the refrigerator, what is the probability that both... more
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Probability Algebra 1

04/09/21

Probability question
A refrigerator contains 10 bottles of water, 7 bottles of apple juice, and 13 bottles of orange juice. If 2 drinks are taken at random from the refrigerator, what is the probability that both... more
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Probability Algebra 1

04/09/21

A box contains 9 orange crayons, 13 grey crayons, 7 purple crayons, and 11 blue crayons. If you randomly pick 2 crayons from the box, what is the probability that neither of them is purple?
A box contains 9 orange crayons, 13 grey crayons, 7 purple crayons, and 11 blue crayons. If you randomly pick 2 crayons from the box, what is the probability that neither of them is purple?
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Probability Math Statistics

04/09/21

A bag contains 50 balls, 20 blue and 30red. Two balls are taken one after another without replacement. Find the probability of getting 2 red balls?.
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Probability Math Statistics

04/09/21

A coin was tossed 400 times and head appeared 221 times. Test the hypothesis that the coin is unbiased.
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Probability Math Statistics

04/09/21

Please find the question below:
In a group of 200 graduate engineering students 100 are enrolled in an advanced course instatistics 50 are enrolled in a course in OR and 30 are enrolled in both. How many of thesestudents are not... more
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Probability

04/09/21

Probability math question

Suppose you pay $1 to play a game in which a pair of fair (6-sided) dice is rolled. If a sum of 6,7, or 8 comes up you win $5. If a 2 or 12 comes up you win $3. Otherwise you lose the dollar you... more
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Probability

04/09/21

Aleks Assignment
A science class has 5 girls and 5 boys in the seventh grade and 5 girls and 3 boys in the eighth grade. The teacher randomly selects a seventh grader and an eighth grader from the class for a... more
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Probability Math

04/08/21

What is the correct mean absolute deviation of the 10 plants?
Mr. O'Lear is conducting an experiment that involves 10 plants. He initially determined that the plants had a mean height of 72 centimeters and a mean absolute deviation of 8.5 centimeters. He... more
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