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12th grade Math-statistics

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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 -

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

    I don't see a list...

  • 12th grade Math-statistics -

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

  • 12th grade Math-statistics -

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

  • 12th grade Math-statistics -

    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 -

    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 -

    Fhagbst i don't get it

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