SOLUTION: The time required to finish a test in normally distributed with a mean of 40 minutes and a standard deviation of 8 minutes. What is the probability that a student chosen at random
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Question 828230: The time required to finish a test in normally distributed with a mean of 40 minutes and a standard deviation of 8 minutes. What is the probability that a student chosen at random will finish the test between 24 and 48 minutes? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! The time required to finish a test in normally distributed with a mean of 40 minutes and a standard deviation of 8 minutes. What is the probability that a student chosen at random will finish the test between 24 and 48 minutes?
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z(24) = (24-40)/8 = -16/8 = -2
z(48) = (48-40)/8 = 8/8 = 1
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P(24< x <48) = P(-2< z <1) = 0.8186
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Cheers,
Stan H.
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