What is the lowest amount spent by the upper 25% of market customers?

At a local market, the average weekly grocery bill is $57.85 with a standard deviation of $14.25. Assume the distribution is normal. Use the area of the normal curve to answer the question.

67.40 is what i came up with.
any one mind cross checking?

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One Response to “What is the lowest amount spent by the upper 25% of market customers?”

  1. O'Neil July 29, 2013 at 11:24 am #

    it is ok, i guess, for all practical purposes
    u must have used 0.67 as the nearest z-value to 2 DP
    but if u use a more accurate table, or interpolate

    the answer comes to $ 67.46

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