SOLUTION: Suppose the distribution of heights of a group of 300 children is normal with mean of 160 cm and a standard deviation of 15cm. About how many of these children are less than 145cm
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Question 968184: Suppose the distribution of heights of a group of 300 children is normal with mean of 160 cm and a standard deviation of 15cm. About how many of these children are less than 145cm tall? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! Suppose the distribution of heights of a group of 300 children is normal with mean of 160 cm and a standard deviation of 15cm. About how many of these children are less than 145cm tall?
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z(145) = (145-160)/15 = -15/15 = -1
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P(x < 145) = P(z < -1) = o.1587
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Ans: 0.1587*300 is approximately 48
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Cheers,
Stan H.
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