Question

The mean amount spent by a family of four on food per month in U.S. is unknown, but we assume that the distribution of the food costs is normal. A research firm selected 100 families and found that the mean amount is $500 with a standard deviation of $75. What is the probability that a randomly selected family of four spends less than $480 per month? (Round your answer to 4 decimal places.)



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  • CreatedAugust 05, 2013
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