Asked by Jodine

The annual sales, in millions, for 28 toy department stores is listed.
A)Calculate the mean and standard deviation of the data. Answer to the nearest tenth.
B) Calculate the percent of sales to the nearest whole number, that are:
i)within one SD of the mean

ii)within two SD of the mean

Answers

Answered by Al
"The annual sales, in millions, for 28 toy department stores is listed."

I don't see a list...
Answered by Damon
The folowing calculator link might help:
http://qudata.com/online/statcalc/
Answered by Damon
hit "clear", then enter your data on the left, then "calc"
Answered by Damon
If your data is not in ascending order of sales, hit "sort" so the second part of your question will be easier.
Answered by Damon
I get mean = 32.3
sigma = 6.45 so 2 sigma = 2*6.45 = 12'9
and here is your list ordered

mean - 12.9 = 19.4 , below your whole list

21.0
23.0
24.0
24.0
24.0
note here is mean - 6.45
27.0
27.0
27.0
27.0
29.0
31.0
32.0
note mean = 32.3
33.0
33.0
33.0
33.0
33.0
34.0
35.0
35.0
35.0
36.0
38.0
38.0
note - here is mean + 6.45
40.0
43.0
44.0
45.0
note - here is mean + 12.9 - below your list
your whole list is within 2 sigma of mean 100%
19/28 is within 1 sigma of mean
100 * 19/28 = 68% within 1 sigma
Answered by Wow
Fhagbst i don't get it
Answered by SHATRA
My hands hurt.
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