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160 Answered Questions for the topic Standard Deviation

Standard Deviation

10/25/17

HOW MANY STUDENTS SCORED WITHIN ONE STANDARD DEVIATION OF THE MEAN? PLEASE SHOW WORKING OUT

MEAN : 6.3 MODE:6 MEDIAN:6 STUDENTS SCORES: 4,5,5,6,6,6,7,7,8,9 STANDARD DEVIATION: 1.49
Standard Deviation

10/06/17

standard deviation

country a annual exports to country b are $3.2bilion on average with standard deviation of 0.28 billion. country a annual imports to country b are $3.5 bilion on average with standard deviation of... more
Standard Deviation

10/06/17

net income standard deviation

how would you find the standard deviation of the net income? 
Standard Deviation Statistics

09/15/17

Standard deviation 3

In a large class of 500 students, the mean and standard deviation of a final exam are 65 and 11, respectivelyIf the grades have symmetric distribution, how many students have grades within 2... more

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
Standard Deviation Statistics Math Help

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
Standard Deviation

06/24/17

Mean and Standard Deviation

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

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
Standard Deviation Precalculus Statistics

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
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
Standard Deviation Statistics Mean

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
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?
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
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. 
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
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
Standard Deviation Math Statistics

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
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
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
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
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
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?
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?
Standard Deviation Statistics Finance

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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