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The taxi and takeoff time for commercial jets is a random variable x with a mean...

The taxi and takeoff time for commercial jets is a random variable x with a mean of 8.5 minutes and a standard deviation of 2.1 minutes. Assume that the distribution of taxi and takeoff times is approximately normal. You may assume that the jets are lined up on a runway so that one taxies and takes off immediately after the other, and that they take off one at a time on a given runway.

(a) What is the probability that for 34 jets on a given runway, total taxi and takeoff time will be less than 320 minutes? (Round your answer to four decimal places.)


(b) What is the probability that for 34 jets on a given runway, total taxi and takeoff time will be more than 275 minutes? (Round your answer to four decimal places.)


(c) What is the probability that for 34 jets on a given runway, total taxi and takeoff time will be between 275 and 320 minutes? (Round your answer to four decimal places.)

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Answer #1

Here we are given - Ч. 5 { — W ( ҮГ Хzy { y 2 R9 . 2- J54 м2. — 3ч 2.1)८ 320) = POEM - 289 22 20-28- उप-२। प.1) _ (2 ८310) - ( 2 ८ । ) U342। ___0.34»२.) _-b.११५ EिX2275) - 1-PEN - 281 275-28१ । _

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