8,918 Answered Questions for the topic statistics

Statistics

03/26/23

help me pls i need help

The lengths of pregnancies in a small rural village are normally distributed with a mean of 269 days and a standard deviation of 17 days. In what range would you expect to find the middle 95% of... more
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Statistics

03/26/23

P(z<c)=0.8854 Find C
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Statistics

03/25/23

Statistics and Probability
Out of 600 people sampled, 96 had kids.The best point estimate for p is Incorrect.The margin of error for a 99% confidence interval is Incorrect.Give your answers as decimals to 3 places.
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Statistics

03/25/23

Statistic and Probability
If n = 260 and p(hat)^ = 0.65, construct a 99% confidence interval.
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Statistics

03/24/23

statistics and probability

According to a 2009 Reader's Digest article, people throw away about 7% of what they buy at the grocery store. Assume this is the true proportion and you plan to randomly survey 186 grocery... more
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Statistics

03/24/23

Statistics and Probability
In a recent year, the Better Business Bureau settled 75% of complaints they received. You have been hired by the Bureau to investigate complaints this year involving computer stores. You plan to... more
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Statistics

03/24/23

Statistics and Probability

Based on historical data, your manager believes that 34% of the company's orders come from first-time customers. A random sample of 109 orders will be used to estimate the proportion of... more
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Statistics

03/24/23

What is the first step in the following problem: (6 + 2)² ÷ 12 x 3?
What is the first step in the following problem: (6 + 2)² ÷ 12 x 3?
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Statistics

03/24/23

Selecting probabilities

The grade appeal process at a university requires that a jury be structured by selecting four individuals randomly from a pool of ten students and thirteen faculty.​ (a) What is the probability of... more
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Statistics Probability

03/23/23

Statistics Question
At a restaurant, the time a customer has to wait before being seated follows an exponential distribution and is given by the probability density function (pdf): f(t)=1e−1t Find the probability that... more
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Statistics Probability

03/22/23

Statistics Question
The actual volumes of quart-size bottles of Heinz Ketchup are uniformly distributed from 31.46 to 32.6 fluid ounces. Find the standard deviation in volumes of quart-size Heinz Ketchup bottles (in... more
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Statistics Probability

03/22/23

Statistics Question

The probability density of a random variable X is given in the figure below. From this density, the probability that X is between 0.32 and 1.8 is:
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Statistics Probability

03/22/23

Statistics Question
A certain insurance company sells an home and auto insurance policy that covers losses incurred by a policy holder, subject to a deductible of $202. Losses incurred follow an exponential... more
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Statistics Probability

03/22/23

Statistics Question
The life (in months) of a certain computer component has a probability density function defined by f(x)=14e−x/4 for x in [0,∞). Find the probability that a component randomly selected will last... more
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Statistics Probability

03/22/23

Statistics Question
The average number of radioactive particles passing through a counter during 1 millisecond in a lab experiment is 13. Find the probability that more than 4 milliseconds pass between particles.
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Statistics Probability

03/22/23

Statistics Question

A professor must spend different amounts of time with each student to help with various topics during office hours. These times follow an exponential distribution with the average amount of time of... more
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Statistics Probability

03/22/23

Statistics Question

The lengths of a runner's workout have a continuous uniform distribution between 49.29 min and 55.55 min. If one such workout is randomly selected, find P49 P49 = (Report answer accurate to... more
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Statistics Probability

03/22/23

Statistics Question

Suppose that the value of a stock varies each day from $10.82 to $29.17 with a uniform distribution.Find the upper quartile; 25% of all days the stock is above what value? (Enter your answer to the... more
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Statistics

03/22/23

The heights of US adult males are nearly normally distributed with a mean of 69 inches and a standard deviation of 2.8 inches. Find the -score of a man who is 63 inches tall.

The heights of US adult males are nearly normally distributed with a mean of 69 inches and a standard deviation of 2.8 inches. Find the �-score of a man who is 63 inches tall.  Round to two decimal... more
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Statistics Math

03/22/23

z = -3 is what percentile?
z = -3 is what percentile? percentileState your answer to the nearest tenth of a percent.
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Statistics Math

03/22/23

The weights of a certain dog breed are approximately normally distributed with a mean of μ = 56 pounds, and a standard deviation of σ = 6 pounds.
A dog of this breed weighs 46 pounds. What is the dog's z-score? Round your answer to the nearest hundredth as needed. z= A dog has a z-score of 1.2. What is the dog's weight? Round your answer to... more
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Statistics Math

03/22/23

Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches. Find the height of a man with a z-score of 3.2 (to 2 decimal places)
Awnser:
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Statistics Math

03/22/23

On a recent quiz, the class mean was 74 with a standard deviation of 4.4.

On a recent quiz, the class mean was 74 with a standard deviation of 4.4. Calculate the z-score (to 2 decimal places) for a person who received score of 63.z-score: Is this unusual?  Unusual Not... more
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Statistics Math

03/22/23

Height of a man
The heights of adult men in America are normally distributed, with a mean of 69.1 inches and a standard deviation of 2.63 inches. The heights of adult women in America are also normally... more
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Statistics Math

03/22/23

The graph illustrates the distribution of test scores taken by College Algebra students. The maximum possible score on the test was 130, while the mean score was 75 and the standard deviation was 12.
39 51 63 75 87 99 111Use the "Empirical Rule", not a calculator or other technology. Do not round your answers.What is the approximate percentage of students who scored between 75 and 87 on the... more
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