Question 745209
Suppose the distribution of heights of a group of 200 children is normal, with a mean of 150 centimeters and a standard deviation of 15 centimeters. About how many of these children are shorter than 120 centimeters?
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z(120) = (120-150)/[15] = -2
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P(x < 120) = P(z < -2) = normalcdf(-100,-2) = 0.023
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# of children shorter than 120 cm is 0.023*200 = 5 when rounded up.
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Cheers,
Stan H.
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