Question 514001
the total cholesterol in children aged 10-15 is assumed to follow a normal distribution with a mean of 191 and a standard deviation of 22.4. 
what is the proportion of children 10-15 years of age have total cholesterol between 180 and 190?
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z(180) = (180-191)/22.4 = -0.4911
z(190) = (190-191)/22.4 = -0.0446
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P(180 < x < 190) = P(-0.4911 < z < -0.0446) = 0.1705
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Cheers,
Stan H.
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