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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%.
For what proportion of these corporations was the rate of return
higher than 20%?
For what proportion of these corporations was the rate of return
negative?
For what proportion of these corporations was the rate of return
between 5% and 15%?

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  • 1. 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%. For what proportion of these corporations was the rate of return higher than 20%? For what proportion of these corporations was the rate of return negative? For what proportion of these corporations was the rate of return between 5% and 15%?