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Probability that the avearage age

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Based on FAA estimates the average age of fleets of the 10 largest U.S. commercial passenger carriers is 13.4 years with a standard deviation of 1.7 years. Suppose that 40 airplanes were randomaly selected from fleets of these 10 carriers and were inspected for cracks in these airplanes that are considered too large for flying. What is the probability that the avearage age of these 40 airplanes is at least 14 years old? Round 4 decimal places. Remeber round ypur z-value to 2 deciimal places.

Reference no: EM131061391

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