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Posted by on Friday, November 16, 2012 at 11:28am.

The mean amount spent by a family of four on food per month is $550 with a standard deviation of $85. Assuming that the food costs are normally distributed, what is the probability that a family spends less than $410 per month?

  • math - , Saturday, November 17, 2012 at 12:46pm

    Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion that relates to your Z score.

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