Question 720785: mu=40, sigma=10. If random samples of size n = 25 are selected from this population, what proportion of sample means will have values between 38 and 42?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! mu=40, sigma=10. If random samples of size n = 25 are selected from this population, what proportion of sample means will have values between 38 and 42?
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z(38) = (38-40)/10 = -2/10 = -0.2
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z(42) = (42-40)/10 = +0.2
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P(38< x <42) = P(-0.2< z <0.2) = normalcdf(-0.2,0.2) = 0.1585
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cheers,
Stan H.
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