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

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

  • 12th grade Math-statistics - , 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 - , Saturday, December 13, 2008 at 11:11am

    The folowing calculator link might help:
    http://qudata.com/online/statcalc/

  • 12th grade Math-statistics - , Saturday, December 13, 2008 at 11:17am

    hit "clear", then enter your data on the left, then "calc"

  • 12th grade Math-statistics - , Saturday, December 13, 2008 at 11:18am

    If 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 - , Saturday, December 13, 2008 at 4:57pm

    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

  • 12th grade Math-statistics - , Tuesday, January 6, 2009 at 10:56pm

    Fhagbst i don't get it

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