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160 Answered Questions for the topic Standard Deviation

Standard Deviation

08/09/16

standard deviation

A report claims that the returns for the investment portfolios with a single stock have a standard deviation of 0.4848?, while the returns for portfolios with 3131 stocks have a standard deviation... more
Standard Deviation Math Help Full Answer

08/08/16

If there are 10,300 people in this community, what is the standard deviation of the number of people who suffer from insomnia?

Consider the following binomial experiment: A study in a certain community showed that 9% of the people suffer from insomnia.
Standard Deviation College Algebra

07/10/16

standard deviation

Nationwide it has been shown that the average height of American adult men is approximately 69.7 inches and a standard deviation of 2.7 inches. Assuming that the heights are normally distributed... more
Standard Deviation College Algebra

07/09/16

Standard Deviation

Suppose that the scores on particular FDMAT 108 unit exam at BYU-Idaho were approximately normally distributed with a mean of 74 and a standard deviation of 8.   7. About what percentage of the... more
Standard Deviation

07/02/16

The mean clotting time of blood is 7.45 seconds with a standard deviation of 3.6 seconds..

The mean clotting time of blood is 7.45 seconds with a standard deviation of 3.6 seconds. What is the probability that an? individual's clotting time will be less than 6 seconds or greater than 9... more
Standard Deviation Statistics Question

06/26/16

If birth weights in a population are normally distributed with a mean of 109oz and a standard deviation of 130z.

A) What is the chance of obtaining a birth weight of 141 oz or heavier when sampling birth records at random? B) What is the chance of obtaining a birth weight of 120 or lighter?
Standard Deviation Statistics Mean

05/31/16

Standard deviation question+answer

The question:   The ages, x years, of 150 cars are summarised by     ∑x = 645 and ∑x2 = 8287.5   Find ∑(x-y)2 where y denotes the mean of x.     The answer:   y= 4.3   standard... more
Standard Deviation Algebra 2 Mode

05/20/16

Standard deviation

set of data with 1200 numbers is normally distributedwith a mean of 27 and a standard deviation of 4. how many numbers in the data would you expect to be between 23 and 31?
Standard Deviation Mean Distribution

05/06/16

Central Limit Theorum

Assume the population mean is µ=12 and standard deviation 2. By Central Limit Theorem the random sample of 121 measurements from this population would have what kind of distribution?
Standard Deviation Statistics Probability

04/23/16

Probability Statistics 1

Readings on a thermometer are normally distributed with a mean of 0C° and a standard deviation of 1.00.What is the probability that a randomly selected thermometer reads:a. Less than 0.53. b.... more
Standard Deviation Null Hypothesis Testing

04/22/16

Null Hypothesis

Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the phone. The organization thinks that, currently, the mean is higher. Fifteen randomly chosen... more
Standard Deviation

04/21/16

Please answer this question

The depot is using a standard of 650 hours for a particular modification effort. You are to review the standard and determine whether it should be revised. After sampling 20 of these modifications... more
Standard Deviation

04/18/16

Can someone check this

Exam scores from a previous STATS 200 course are normally distributed with a mean of 74 and standard deviation of 2.65. Approximately 95% of its area is within: a. One standard deviation of the... more
Standard Deviation Intervals Confidence

04/11/16

help with part of a question

You take a sample of 22 from a population of test scores, and the mean of your sample is 60.You know the standard deviation of the population is 10. What is the 99% confidence interval on the... more
Standard Deviation

04/08/16

Hello, can someone help me answer this question?

2. Consider the following table of the ages of our first six presidents.Ages of the First 6 Presidents at Inauguration Washington 57J. Adams 61Jefferson 57Madison 57Monroe 58J.Q. Adams 57 a. Find... more
Standard Deviation

04/08/16

Standard Deviation, can someone please help me?

 The heart rates for puppies are normally distributed, with a mean heart rate of 180 beats per minute (60-160 beats per minute for most adult dogs) with a standard deviation of 6 bpm (beats per... more
Standard Deviation

03/31/16

The standard deviation of 60% of 250?

Hi Guys, may I please get help with this one problem: 60% of the computer chips produced at a factory are good; the others are defective. A box contains 250 chips from the factor. Let X be the... more
Standard Deviation Deviation Percent

03/30/16

Standard Deviation

Consider a nationally recognized standardized college admissions test with scores that are normally distributed, centered at a mean of 21, and have a standard deviation of 4.5. Use the 68-95-99.7... more
Standard Deviation Statistics Question Mean

03/29/16

Statistics question: A random sample of 40 statistics students had an average test grade of 81.5

A random sample of 40 statistics students had an average test grade of 81.5 and a standard deviation of 10.2. Construct the confidence interval for the population mean, μ if c = 0.90.   The... more
Standard Deviation

03/28/16

Use the following data: 11, 14, 15, 19, 10. What's the standard deviation?

Use the following data: 11, 14, 15, 19, 10. What's the standard deviation?
Standard Deviation Statistics Question Mean

03/27/16

Statistics Question: The repair cost of a Subaru engine is normally distributed with a mean of $5,850 and standard deviation of $1,125.

The repair cost of a Subaru engine is normally distributed with a mean of $5,850 and standard deviation of $1,125. Random samples of 20 Subaru engines are drawn from this population and the mean... more
Standard Deviation Statistics Question Mean

03/27/16

Statistics Question: The temperature in Orlando on a given summer day is normally distributed with a mean of 98.6° F

The temperature in Orlando on a given summer day is normally distributed with a mean of 98.6° F and a standard deviation of 0.60° F. If 36 summer days in Orlando are randomly selected, find the... more
Standard Deviation Statistics Statistics Question

03/27/16

statistics question: The salaries of Pet Detectives are normally distributed with a mean of $32,000

The salaries of Pet Detectives are normally distributed with a mean of $32,000 and a standard deviation of $3000. If 100 Pet Detectives are randomly selected, find the probability that their... more
Standard Deviation Statistics Question Mean

03/22/16

can somone please check my work.

The data from placebo 0mg is listed below. 57,27,32,31,34,38,71,33,34,53,36,42,26,52,36,55,36,42,36,54,34,29,33,33     What is the mean number of correct responses of the participants after... more
Standard Deviation Probability & Statistics

03/20/16

standard deviation find the probability that more than 30%

A manufacturer produces a certain type of components that has a length of 2.1 cm. the distribution of this components is normal with mean 2.15 cm and sd 0.4cm. There are 50 pieces in a bag. Find... more

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