Calculate the mean and standard deviation for this data set:

Calculate the mean and standard deviation for this data set:

Calculate the mean and standard deviation for this data set: 250, 300, 300, 325, 325, 350, 350, 350, 350, 375, 400, 425, 425, 450, 450, 500 (Note: When computing go out to three decimal places and remember to use n – 1 rather than n).


M = 370.313


M = 380.313


M = 370.343


M = 470.373

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Calculate the standard deviation for this data set: 250, 300, 300, 325, 325, 350, 350, 350, 350, 375, 400, 425, 425, 450, 450, 500 (Note: When computing go out to three decimal places and remember to use n – 1 rather than n).


SD = 66.795


SD = 56.596


SD = 66.595


SD = 36.495

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How many books are above the mean?


9


7


5


4

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How many are below the mean?


9


7


5


4

Flag this QuestionQuestion 61 pts


How many books are within one standard deviation of the mean?


11


10


8


7

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What percent of the data is more than one standard deviation above the mean?


33.56%


35.76%


43.57%


43.75%

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Provide the z score for a book with an original number of pages of 425. (Round to three decimal places)


0.305


0.821


-1.807


0.680

Flag this QuestionQuestion 91 pts


Provide the z score for a book with an original number of pages of 300. (Round to three decimal places)


-1.056


0.680


-1.807


0.070

How many pages does a book need to have to fall into the top 25% of pages in this data set?

The book needs to over 494.76 pages to be in the top 25%

The book needs to be over 234.78 pages to be in the top 25%

The book needs to have at least 374.84 pages to be in the top 25%

The book needs to have at least 434.87 pages to be in the top 25%

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