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OpenStudy (anonymous):
A day care program has an average daily expense of $75.00. The standard deviation is $15.00. The owner takes a sample of 64 bills. What is the probability the mean of his sample will be between $70.00 and $80.00? Step 1. Calculate a z-score for $70.00:
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OpenStudy (camerondoherty):
0.993, or 99.3%
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