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Total cholesterol in children aged 10-15 years is assumed to follow a normal distribution with a mean of 191 and a standard deviation of 22.4.

a. what proportion of children 10-15 years of age hfave total cholesterol between 180-190?
b. What proportion of children 10-15 years would be classified as hyperlipidemia(assume that hyperlipidemia is defined as a total cholesterol level over 200)?
c. What is the 90th percentile of total cholesterol?

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