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January 28, 2015

January 28, 2015

Posted by **Jodine** on Friday, December 12, 2008 at 11:22pm.

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

- 12th grade Math-statistics -
**Al**, Saturday, December 13, 2008 at 12:44am"The annual sales, in millions, for 28 toy department stores is listed."

I don't see a list...

- 12th grade Math-statistics -
**Damon**, Saturday, December 13, 2008 at 11:11amThe folowing calculator link might help:

http://qudata.com/online/statcalc/

- 12th grade Math-statistics -
**Damon**, Saturday, December 13, 2008 at 11:17amhit "clear", then enter your data on the left, then "calc"

- 12th grade Math-statistics -
**Damon**, Saturday, December 13, 2008 at 11:18amIf your data is not in ascending order of sales, hit "sort" so the second part of your question will be easier.

- 12th grade Math-statistics -
**Damon**, Saturday, December 13, 2008 at 4:57pmI 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

- 12th grade Math-statistics -
**Wow**, Tuesday, January 6, 2009 at 10:56pmFhagbst i dont get it

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