The annual sales, in millions of dollars, for 28 toy department stores is listed.

Question

38 35 43 27 24 40 38
21 34 27 35 36 24 33
27 33 44 45 23 33 33
24 33 27 32 35 29 31
A)Calculate the mean,(u), and standard deviationof the data. Answer to the nearest tenth.
(My answer): U=32.3 SD=6.3
B) Calculate the percent sales, to the nearest whole number
i)Within one SD of the mean.
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ii)Within two SD of the mean.
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Answer 1

On your standard deviation, I did sigma n-1 and got 6.45. I am not certain what you did.

b. I think it means count the values which are within +- one SD. Count means add them, then divide by the total sales.

Answer 2

For a i used my calc. The 1-Var Stats