Suppose that the serum total cholesterol for males 20 to 29 years old has a N(180,40) distribution. The percent of males aged 20

Question

Suppose that the serum total cholesterol for males 20 to 29 years old has a N(180,40)
distribution. The percent of males aged 20 to 29 with serum total cholesterol level higher than
220 is closest to ("hint -use 68-95-99.7% rule")
O 0.34
0.84
O 0.16
0.68
0.025

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