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posted by  minabruuke on 10/12/2008 8:49:39 PM  |  status: Closed  

Sampling Distributions

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The serum cholesterol levels of a certain population of boys follow a normal distribution with a mean of 170mg/dl and a standard deviation of 30mg/dl.
a) Find the probability that a randomly chosen boy has a serum cholesterol level of 155mg/dl or less.
b)Find the percentage of boys with values between 125mg/dl and 215mg/dl.
c)Find the probability that the mean serum cholesterol level of a random sample of 25 boys is below 182mg/dl.
d)Determine the probability that the mean serum cholesterol level of a random sample of 100 boys is below 164mg/dl.
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posted by John solomon on 10/12/2008 10:24:20 PM  |  status: Live
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