Question 547250: The number of hours per week statistics student spend on line is normally distributed with a mean of 10 hours and a standard deviation of 2 hours. If 35 statistics student are selected at random, how many would you expect to say they spend more than 8 hours per week online ?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The number of hours per week statistics student spend on line is normally distributed with a mean of 10 hours and a standard deviation of 2 hours. If 35 statistics student are selected at random, how many would you expect to say they spend more than 8 hours per week online ?
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z(8) = (8-10)/[2/sqrt(35)] = -5.91
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P(x > 8) = P(z > -5.91) = normalcdf(-5.91,100) = 0.9999
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Expected number = 0.9999*35 = 35
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Cheers,
Stan H.
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