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Find the Operating Cost for the Lowest 10 Percent of the Airplanes

label Mathematics
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Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,425 per hour and a standard deviation of $225. What is the operating cost for the lowest 10 percent of the airplanes? (Round z value to 2 decimal places. Omit the "$" sign in your response.)

Sep 7th, 2014

z value corresponding lowest 10% is -1.28

Lowest operating cost =2425-1.28*225=2137

Answer: 2137

Sep 8th, 2014

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