SOLUTION: A normal population has a mean μ =15 and standard deviation = 4. What is the probability that a randomly chosen value will be greater than 20?
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-> SOLUTION: A normal population has a mean μ =15 and standard deviation = 4. What is the probability that a randomly chosen value will be greater than 20?
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Question 1103301: A normal population has a mean μ =15 and standard deviation = 4. What is the probability that a randomly chosen value will be greater than 20? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A normal population has a mean μ =15 and standard deviation = 4.
What is the probability that a randomly chosen value will be greater than 20?
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z(20) = (20-15)/4 = 5/4
So, 20 is (5/4)th standard deviations above the mean.
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P(x > 20) = P(z > 5/4) = normalcdf(5/4,100) = 0.1056
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Cheers,
Stan H.
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