Question: A Channel 4 News story claims that the city environmental
A Channel 4 News story claims that the city environmental preservation unit pays too much for routine automobile maintenance of the vehicle fleet. The average (mean) amount paid by the unit is $104.15 with a standard deviation of $9.71 (normal distribution). As an initial step, the unit head decides to investigate the most expensive 25% of the routine maintenance bills. According to this criterion, above what dollar amount should bills be investigated?
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