5,385 Answered Questions for the topic probability

Probability Statistics

03/04/22

The amount of time to complete a physical activity in a PE class is approximately normally normally distributed with a mean of 38.2 seconds and a standard deviation of 6.7 seconds.
a) What is the probability that a randomly chosen student completes the activity in less than 31.9 seconds? b) What is the probability that a randomly chosen student completes the activity in more... more
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Probability Statistics

03/03/22

Solving problems involving permutations

A Grade 12 student is taking Biology, English, Math and Physics in her first term. If a student timetable has five courses, how many ways can she schedule her course?
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Probability Math Algebra Sequences

03/02/22

Counting Principle
When ordering the Kids' Lunch at Burger Universe, the customer must choose a size, whether or not to have cheese, a type of bun, a side order, and a type of fruit drink.Here are the possibilities... more
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Probability Math Algebra Sequence

03/02/22

Counting principle
Hale Middle School is going to select a committee. The committee will have a faculty member, a male student, a female student, a parent, and a school board member.Here are the positions and the... more
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Probability

02/28/22

Probabilty question.
The proportion of eligible voters in the next corporation election (in tumkur) who will vote for the incumbent is assumed to be 55%. What is the probability that in a random sample of 500 voters... more
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Probability Statistics

02/28/22

A lottery offers five Php 1000, two Php 5,000, and one Php 10,000. One Thousand tickets are sold at Php 30 each. Find the expectation if a person buys one ticket.
Mean and Variance of the given myu=E[ x times P(x)]
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Probability Statistics

02/28/22

A lottery offers five Php 1000, two Php 5,000, and one Php 10,000. One Thousand tickets are sold at Php 30 each. Find the expectation if a person buys one ticket.
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Probability Statistics

02/27/22

Incidence Rate for an Event
Hi,I'm unsure whether I'm oversimplifying this problem.A zoo records 94,000 visits annually from the residents of a particular region. The region has a population of 67,000 inhabitants. From this,... more
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Probability

02/27/22

A manufacturing machine has a 75% defect rate. If 110 items are chosen at random, answer the following.
A manufacturing machine has a 75% defect rate. If 110 items are chosen at random, answer the following.d) What is the probability that exactly 79 of them are defective?  Round final answer to 4... more
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Probability

02/27/22

Shuffle music bt 3
Charles has three songs on a playlist. Each sing is by a different artist. The artists are cardi b, post malone, and taylor swift. He programs his player to play the songs in a random order,without... more
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Probability Math Sequence Series

02/26/22

Hong is studying the growth of a particular type of plant. He is testing the effects of three growth factors: lighting, age, and temperature. Here are the levels he's testing for each.
GROWTH FACTOR LEVELSLIGHTNING Low, Medium, HighAGE 1... more
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Probability Math Permutation

02/25/22

Some Probability and Permutation questions...
1.  Find the number of permutations of the elements in the set {1, 3, 5, 7, 9, 11}. a. 6                     b. 21             c. 36             d. 7202.  If there are 9! different... more
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Probability Math Algebra Sequences

02/25/22

For the dinner special at a restaurant, the customer must choose a salad, an entree, a side dish, and a dessert. Here are the items to choose from.
Choice  Salad   Southwest, Garden, Caesar   Entree   Grilled chicken, Pot roast, T-bone steak, Lamb, Roast turkey   Side dish   Baked potato, Pinto beans, French... more
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Probability Statistics

02/23/22

In a large school, it was found that 64% of students are taking a math class, 78% of student are taking an English class, and 56% of students are taking both.
A: Find the probability that a randomly selected student is taking a math class or an English class. Write your answer as a decimal, and round to 2 decimal places if necessary.B: Find the... more
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Probability Statistics

02/22/22

How should I approach this question?
At a particular university, students' grades in introductory statistic classes are generally unimodal and skewed to the left with a mean of u = 63 and a standard deviation of o = 18.0. (Round to 2... more
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Probability Statistics

02/22/22

I don’t understand how to solve this?
The distribution of actual weights of wedges of cheddar cheese produced at a dairy is normal with a mean of 9.1 ounces and a standard deviation of 0.2 ounces. (Round to 2 decimal places for all... more
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Probability Statistics

02/22/22

I need help with this.

In a large population of adults, the mean IQ is 123 with a standard deviation of 17. Suppose 60 adults are randomly selected for a market research campaign. (Round to 2 decimal places for all... more
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Probability

02/22/22

Probability question
Past records show that at a given college 20% of the students who began as psychology majors either changed their major or dropped out the school. An incoming class has 110 beginning psychology... more
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Probability

02/21/22

A high school baseball player has a 0.221 batting average. In one game, he gets 7 at bats. What is the probability he will get at least 5 hits in the game?
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Probability

02/21/22

A high school baseball player has a 0.221 batting average. In one game, he gets 7 at bats. What is the probability he will get at least 5 hits in the game?
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Probability And Statistics

02/21/22

A high school baseball player has a 0.221 batting average. In one game, he gets 7 at bats. What is the probability he will get at least 5 hits in the game?
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Probability Math English Statistics

02/19/22

A computer manufacturing company claims…
A computer manufacturing company claims that only 7.3% of their computers are returned. Kelly thinks that the company is misrepresenting the true proportion of computers that are returned, and that... more
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Probability Math English Statistics

02/19/22

A 90% confidence intervals for the proportion…
A 90% confidence intervals for the proportion of first-year statistics students with brown hair is given to be (0.25, 0.41).(a) What is the sample proportion of students with brown hair? (Round to... more
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Probability Math English Statistics

02/19/22

A poll of 855 home sellers found that 28.7%…
A poll of 855 home sellers found that 28.7% were trying to sell their home without a real estate agent. The margin of error for this poll was 3.6%. Find the approximate confidence level used by the... more
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Probability Math English Statistics

02/19/22

A researcher would like to estimate the proportion…
A researcher would like to estimate the proportion of home-based businesses owned by women. What is the minimum sample size needed to be 99% confident with a 3.9% margin of error? (Round your... more
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