# 5.25 An investment portfolio contains stocks of a large number of corporations. Over the last year the

## Question:

5.25 An investment portfolio contains stocks of a large number of corporations. Over the last year the rates of return on these corporate stocks followed a normal distribution with mean 12.2% and standard deviation 7.2%.

**a.** For what proportion of these corporations was the rate of return higher than 20%?

**b.** For what proportion of these corporations was the rate of return negative?

**c.** For what proportion of these corporations was the rate of return between 5% and 15%?

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**Related Book For**

## Statistics For Business And Economics

**ISBN:** 9780273767060

8th Global Edition

**Authors:** Paul Newbold, Mr William Carlson, Ms Betty Thorne