Question 445831: IQ scores in a general adult population have mean 100 and standard deviation 15. A simple random sample of 50 adults is selected, and the sample mean x of their IQ scores is computed.
What is the probability that the sample mean IQ score is greater than 105.0? Give your answer as a number between 0 and 1, rounded to 3 decimal places.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! IQ scores in a general adult population have mean 100 and standard deviation 15. A simple random sample of 50 adults is selected, and the sample mean x of their IQ scores is computed.
What is the probability that the sample mean IQ score is greater than 105.0? Give your answer as a number between 0 and 1, rounded to 3 decimal places.
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z(105) = (105-100)/15 = 1/3
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P(x > 105) = P(z > 1/3) = normalcdf(1/3,100) = 0.369
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Cheers,
Stan H.
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