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Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with...

Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,025 per hour and a standard deviation of $220. What is the operating cost for the lowest 10 percent of the airplanes? (Round z value to 2 decimal places)

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Answer #1

Given that,

P(Z < -1.28) = 0.10

z = -1.28

Using z-score formula,

x = z * +

x = -1.28 * 220 + 2025 = 1743.4

Operating cost = 1743.4

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