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Determining the total cholesterol of children

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Total cholesterol in children 10 to 15 years of age is assumed to follow a normal distribution with a mean of 191 mg/dl and a standard deviation of 22.4. What proportion of children 10 to 15 years of age have a total cholesterol:

a. What proportion of children 10 to 15 years of age has total cholesterol between 180 and 190?

b. What proportion of children 10 to 15 years of age would be classified as hyperlipidemic? (Assume that hyperlipidemia is defined as a total cholesterol level over 200).

c. If a sample of 20 children is selected, what is the probability that the mean cholesterol level in the sample will exceed 200?

Reference no: EM132845665

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