SOLUTION: Suppose commuting times to work are normally distributed with mean 25 minutes and standard deviation 6.1 minutes. Find the probability that a randomly selected spends more than 20

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Question 819871: Suppose commuting times to work are normally distributed with mean 25 minutes and standard deviation 6.1 minutes. Find the probability that a randomly selected spends more than 20 minutes commuting.
A).8190
B).6808
C).1230
D).2440
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Suppose commuting times to work are normally distributed with mean 25 minutes and standard deviation 6.1 minutes. Find the probability that a randomly selected spends more than 20 minutes commuting.
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z(20) = (20-25)/6.1 = -0.8197
P(x > 20) = P(z > -0.8197) = normalcdf(-0.8197,100) = 0.7938
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Cheers,
Stan H.
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