182 Answered Questions for the topic Standard Deviation

09/03/17

What is the proportion of all students that have breathing rates between 14.5 and 17.5 breaths per minute?
Full question----->  Suppose that the breathing rates for college-age students have a mound-shaped distribution, with a mean equal to 16 and standard deviation of 1.5 breaths per minute. What is... more
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07/29/17

Compare and contrast the following measures of dispersion (range, standard deviation) in terms of what each of these represent and in terms of the relative adva
Compare and contrast the following measures of dispersion (range, standard deviation) in terms of what each of these represent and in terms of the relative advantages/disadvantage of using one over... more
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Standard Deviation

06/24/17

Mean and Standard Deviation
Calculate the mean and standard deviation for the set of numbers{11,16, 20,17}
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Standard Deviation Precalculus Math Help Z Scores

06/01/17

Standard deviation
A tile company produces floor tiles that has an average thickness of 55mm, with a standard deviation of 0.6mm. For premium quality floors, the tiles must have a thickness between 54mm and 55mm.... more
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Standard Deviation Precalculus Statistics Math Help

05/31/17

Standard deviation (statistics)
billy has 15 min to get to his after-school job. Despite his best efforts, he is frequently late. His employer says that unless he arrives to work on time consistently, he will lose his job. He has... more
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Standard Deviation Precalculus Math Help

05/30/17

Z-score and standard deviation
Determine the z- score for the given value  Mean=9.3  standard deviation= 0.4  x=8.8
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Standard Deviation Statistics Mean Z Score

05/25/17

What would the mean be?
Person A has a z-score of -3 and is on her phone for 7 hours a day. Person B has a z-score of -4 and is on her phone for 3 hours a day. It is a normal distribution. What would be the mean of the... more
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Standard Deviation

05/25/17

Mean and standard deviation-PLEASE HELP!
2.8, 3, 3.7, 4.3, 3.2, 2.9   What is the mean and the standard deviation?
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Standard Deviation

05/05/17

The scores for a standardized reading test...
Full problem: -The scores for a standardized reading test are found to be normally distributed with a mean of 300 and a standardized deviation of 42. If the test is given to 500 students, how many... more
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Standard Deviation

04/29/17

For a 92 on a test with a class mean of 78 and a standard deviation of 12
Assume the test scores are normally distributed. 
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Standard Deviation Math Probability & Statistics

04/08/17

how to find standard error using only x=47, n=95, and the confidence level is 99.9%
I am just confused on how to find the standard error without having a standard deviation
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Standard Deviation

03/20/17

How can you use standard deviation to represent the spread of data?
I would like to understand how does standard deviation  relate to the spread of data
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Standard Deviation Math Statistics Statistics Question

02/24/17

The monthly utility bills in a city have an average of $67 and an SD of $7. The percentage of the utility bills in this city that are above $75 is:
 I am struggling with this homework for a stats course. The teacher is very unclear and I cannot afford to fail. Any help would be appreciated it
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12/15/16

The mean of normal probability distribution is 200 pounds the standard deviation is 5 pounds what is the area between 215 pounds and the mean of 200 pounds
What is the area between 214 pounds and the mean of 200 pounds
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Standard Deviation

12/09/16

Standard Deviation
Suppose that the scores on particular FDMAT 108 unit exam at a University were normally distributed with a mean of 78 and a standard deviation of 10. 1. About what percentage of the scores were... more
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Standard Deviation

12/03/16

What is the z-score
the number of nuts in a can of mixed nuts is found to be normally distributed, with a mean of 500 nuts and standard deviation of 20 nuts. my can of mixed nuts has only 475 nuts. what is the z-score... more
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Standard Deviation

11/29/16

68-95-99.7 Rule question
Consider a standardized Intelligence Quotient (IQ) test that results in IQ scores which are normally distributed with a mean of 100 and a standard deviation of 15. Use the 68-95-99.7 Rule to find... more
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Standard Deviation

10/19/16

Two sets of data produce two identical means of 9.5 and 9.5, however the Standard Deviations are 0.55 and 1.75. What is the reason for this
d) Differences in the experimental design b) Equal variance of data points around the two means a) The data points varied more widely around the mean for the higher SD value c) The data points... more
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Standard Deviation

09/26/16

A normal distribution has a mean of 142 and a standard deviation of 16. What is the probability that a randomly selected value lies between 142 and 174?
A normal distribution has a mean of 142 and a standard deviation of 16.What is the probability that a randomly selected value lies between 142 and 174?
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Standard Deviation

09/02/16

If the mean is 10% and the standard deviation is 13%.. what are the 1st 2nd and 3rd standard deviation ranges?
Looking for the range of outcomes.   I believe they are as follows.   1 SD  = -3% to +23% 2 SD =  -16% to +46% 3 Sd = -39% to + 59%   Is this correct?
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Standard Deviation Statistics Finance Rate Of Return

08/11/16

How to find the minimum variance portfolio, 2 company's, 5 portfolios.
Hi   i have found out the following     Weight in Kingsley Weight in Duvall ER SD 0.0%    100.0%  15.00     25.0025.0%   75.0%   13.75     21.25 50.0%   50.0%   12.50     18.8775.0%   25.0%... more
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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
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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.
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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
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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... more
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