182 Answered Questions for the topic Standard Deviation

Standard Deviation Math Statistics Mean

03/04/22

How many days did it take the patient to recover?
If the recovery time for a surgery is normally distributed with a mean of 6.1 days and a standard deviation of 2.5 days. And the z-score for a recovery time is -1.45, how many days did the patient... more
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Standard Deviation Statistics Mean Normal Distribution

02/04/22

Julio observed that customer satisfaction ratings are normally distributed. If the 33rd percentile is 6.775, and the 65th percentile is 7.394 on a scale from 0-10 find the mean and standard deviation
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Standard Deviation Statistics

01/21/22

When dragons on planet Pern lay eggs, the eggs are either green or yellow. The biologists have observed over the years that 32% of the eggs are yellow, and the rest green.
When dragons on planet Pern lay eggs, the eggs are either green or yellow. The biologists have observed over the years that 32% of the eggs are yellow, and the rest green. Next spring the lead... more
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08/14/21

What is +/- 2 SEM? How would I calculate that? The standard error is 2.786, the standard deviation is 6.229, and the mean is 42.6.
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06/12/21

what percent of these differ from the population mean(nomal distribution)
if a set of observations is normally distributed, what percent of these differ from the population mean by more than 0.96σ, where σ is the population standard deviation.
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Standard Deviation Statistics Economics Econometrics

06/06/21

How do you calculate the confidence intervals for a population mean with only the sample mean and sample standard deviation?
I have a random sample and need to calculate the 95% confidence interval for the population mean(sample mean = 1076sample standard deviation = 80.61sample size is n=5)
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Standard Deviation Math Statistics Probability

05/24/21

Question about average thickness, standard deviation and probability distribution
Each manufacturer of sliced bread has to choose how thin to slice their bread. It turns out that sliced bread in the US has an average thickness (μ) of 9.2mm, a standard deviation (σ) of 2.5mm, and... more
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Standard Deviation Math Statistics

05/23/21

what is the standard deviation of this?
what is the standard deviation of the number of dart throws I have to make until I get a bulls-eye (assuming my chances of making a bulls-eye on any throw is 0.739).
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Standard Deviation Math Statistics Probability

03/07/21

Standard Deviation

A random variable is normally distributed with mean 96.1 and a standard deviation of 7.9. what value is 2 standard deviations about the mean
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Standard Deviation Math Statistics Probability

03/07/21

Standard Deviation

A random variable is normally distributed with the mean 26.2 and a standard deviation 19.6. what value is 2 standard deviations below the mean?
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Standard Deviation Statistics

02/14/21

2. If the given two sample data sets have the same standard deviation, are these samples necessarily identical? Justify your answer
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Standard Deviation Math Statistics Sample Mean

02/01/21

Problem Solving
The formula for the standard error (standard deviation of the distribution of sample means) implies that as the sample size (n) increases, the size of the standard error decreases. Explain the role... more
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Standard Deviation Math Statistics Statistics Question

01/19/21

standard deviation question
What happens to the curve when the standard deviation is increased? What does that do to the area under the curve? What happens to the curve when the standard deviation is decreased? What does... more
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Standard Deviation Math Statistics Values

11/24/20

Statistics test
The Census Bureau reports that 27% of California residents were born outside the Untied States. Suppose that you choose four Californians independent of each other and at random. Let F = the number... more
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Standard Deviation Statistics Mean Expected Value

10/25/20

How to solve questions regarding drawing cards from a standard deck of 52?
Mark draws one card from a standard deck of 52. He receives $ 0.50 for a heart, $ 0.65 for a jack and $ 0.85 for the jack of hearts. How much should he pay for one draw?This is how i attempted to... more
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Standard Deviation Math Statistics

10/13/20

How do i find the value thats one standard deviation below the mean ? I'm stuck on this part of my homework
Not sure how i'm suppose to solve this problem.The following data are the distances between a sample of 20 retail stores and a large distribution center. The distances are in miles.29; 30; 37; 40;... more
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Standard Deviation

10/03/20

Math Homework Help! Statistics Standard Deviation

The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 51 ounces and a standard deviation of 11 ounces.Use the Standard... more
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Standard Deviation Math Statistics Probability

07/27/20

Data Management Probability, Standard Deviation, and Normal Distribution Question:

Hi, how would i get started on solving this question? The average monthly rainfall in Southern California is 26 mm. If rainfall data over the year is normally distributed with a standard deviation... more
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Standard Deviation Mean

07/06/20

Mean of Test scores
the mean of normal distributed test score is 79 and the standard deviation is 5 if there are 242 test scores in the data sample how many of them were in the 84 to 94 range
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Standard Deviation Statistics Psychology

06/30/20

STATS IN PSYCHOLOGY

Assume your class took a final exam in psychology in which the scores produced a normal curve with a mean score of 80 and a standard deviation of 5. If the student scores within two standard... more
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Standard Deviation Math Statistics Mean

06/12/20

Statistics with confidence intervals

A random sample of 80 college students was asked, “How many hours do you study each week?” After gathering the data, the sample has a mean of 14 hours and a standard deviation of 2.8 hours.... more
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Standard Deviation Math Statistics Mean

06/12/20

Intro to statistics

Suppose we want to estimate the average IQ score for the population of statistics students. What is the minimum number of statistics students that must be randomly selected for IQ tests if we want... more
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Standard Deviation Math Statistics Probability

06/12/20

probability in statistics

The number of hours an American adult sleeps each night follows a Normal distribution with an average of 6.9 hours per night with a standard deviation of 0.68 hours. If we randomly select one... more
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Standard Deviation Math Statistics Probability

06/12/20

Probability in statistics and standard deviation

The number of hours an American adult sleeps each night follows a Normal distribution with an average of 6.9 hours per night with a standard deviation of 0.68 hours. If we take a random sample of... more
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Standard Deviation Math Statistics Math Help

05/21/20

Math Problem with Standard deviation and Expected Time
A survey was done on a group of people that asked the time, , it takes them to commute to work, rounded to the nearest 10 minutes. Use the probability distribution table below to answer Part 1-2.X... more
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