<PRE><B>Question 1080761</B>
The mean and standard deviation of flight durations between two cities with SkyBlue Airlines is 1 hour and 15 minutes, and 10 minutes respectively. What is the probability that a random sample of 64 flights will have a mean of 1 hour and 18 minutes or more? 
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1 hr 18 min = 78 min
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z(78) = (78-75)/[(10/sqrt(64)) = 3/(10/8) = 2.4
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P(x-bar &gt; 78) = P(z &gt; 2.4) = normalcdf(2.4,100) = 0.0082
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Cheers,
Stan H.
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