Question

Asked Oct 31, 2019

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Find the standard deviation of the distribution in the following situations.

(a) MENSA is an organization whose members have IQs in the top 2% of the population. IQs are normally distributed with mean 100, and the minimum IQ score required for admission to MENSA is 132.

(b) Cholesterol levels for women aged 20 to 34 follow an approximately normal distribution with mean 185 milligrams per deciliter (mg/dl). Women with cholesterol levels above 220 mg/dl are considered to have high cholesterol and about 18.5% of women fall into this category.

Step 1

a)

It is given that the mean is 100.

The IQs in the top 2% of the population represents the area of 0.02 to the right of z. The z-score for the top 2% of the population using standard normal table is 2.05.

Step 2

The standard deviation is o...

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