<PRE><B>Question 968184</B>
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 &lt; 145) = P(z &lt; -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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