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Math Help - Statistics standard deviation

  1. #1
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    Statistics standard deviation

    Can you help me with the following problem. I can work out that the variation is 2 standard deviations from the mean but how do I know that includes 95% of results?

    A store manager determined the store's mean daily receipts as $550 with standard deviation of $200. On what proportion of days were the daily receipts between $150 and $950?
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  2. #2
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    Re: Statistics standard deviation

    Do you know the 68, 95, 99.7 rule?
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