Posted by **Jodine** on Friday, December 12, 2008 at 10:00pm.

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

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.

?????????????????????

ii)Within two SD of the mean.

??????????????????????????

- Math-statistics -
**bobpursley**, Friday, December 12, 2008 at 10:28pm
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.

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