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...
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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...
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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...
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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...
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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?

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...
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#### 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?

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?

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....
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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#### 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...
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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...
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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?

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...
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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...
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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...
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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...
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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...
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