Adult us women are known to have cholesterol levels that, Ask an Expert

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Adult US women are known to have cholesterol levels that are N(189 mg/dL, 25 mg/dL).

a) What % of US women would you expect to have cholesterol levels below 135?
b) Estimate the 25th percentile of these cholesterol levels.
c) Estimate the interquartile range of these cholesterol levels.

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