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Thread: statistic (2)

  1. #1
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    statistic (2)

    The number of personal computers sold in a week by a computer for a period of 25 weeks is given as follows .

    10 8 7 4 4 18 9 14 17 11 5 4 5 7 10 12 14 10 9 29 7 6 5 20 15

    Find the percentage of the weeks that the weekly sales of the personal computers are within one standard deviation from the mean .


    I don understand what the questino is asking .THanks for the help .
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  2. #2
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    Quote Originally Posted by thereddevils View Post
    The number of personal computers sold in a week by a computer for a period of 25 weeks is given as follows .

    10 8 7 4 4 18 9 14 17 11 5 4 5 7 10 12 14 10 9 29 7 6 5 20 15

    Find the percentage of the weeks that the weekly sales of the personal computers are within one standard deviation from the mean .


    I don understand what the questino is asking .THanks for the help .
    Calculate the mean of the data. Calculate the standard deviation of the data. Calculate the interval [mean - sd, mean + sd]. Count how many data lie in this interval. Convert the number you counted into a percentage out of 25.
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  3. #3
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    Quote Originally Posted by mr fantastic View Post
    Calculate the mean of the data. Calculate the standard deviation of the data. Calculate the interval [mean - sd, mean + sd]. Count how many data lie in this interval. Convert the number you counted into a percentage out of 25.

    understood , thanks a lot .
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