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I'm having difficulty with this question Total cholesterol in children aged 10-15 is assumed to follow a normal distribution with amean of 191 and a

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Total cholesterol in children aged 10-15 is assumed to follow a normal distribution with amean of 191 and a standard deviation of 22.4.a.What proportion of children 10-15 years of age have total cholesterol between 180 and190?

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