An investment portfolio contains stocks of a large number of corporations. Over the last year the rates of retum on these corporate stocks followed a normal distribution with mean 14.6% and standard deviation 7.5% a. For what proportion of these corporations was the rate of return higher than 18%? 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 10% and 20%? E Click the icon to view the standard normal table of the cumulative distribution function. a. The proportion of corporations whose rate of return was higher than 18% is. (Round to four decimal places as needed.) b. The proportion of corporations whose rate of return was negative is (Round to four decimal places as needed.) c. The proportion of corporations whose rate of return was between 10% and 20% is. (Round to four decimal places as needed.)

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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 14.6% and standard deviation 7.5%.
a. For what proportion of these corporations was the rate of return higher than 18%?
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 10% and 20%?
E Click the icon to view the standard normal table of the cumulative distribution function.
a. The proportion of corporations whose rate of return was higher than 18% is
(Round to four decimal places as needed.)
b. The proportion of corporations whose rate of return was negative is
(Round to four decimal places as needed.)
c. The proportion of corporations whose rate of return was between 10% and 20% is
(Round to four decimal places as needed.)
Transcribed Image Text: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 14.6% and standard deviation 7.5%. a. For what proportion of these corporations was the rate of return higher than 18%? 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 10% and 20%? E Click the icon to view the standard normal table of the cumulative distribution function. a. The proportion of corporations whose rate of return was higher than 18% is (Round to four decimal places as needed.) b. The proportion of corporations whose rate of return was negative is (Round to four decimal places as needed.) c. The proportion of corporations whose rate of return was between 10% and 20% is (Round to four decimal places as needed.)
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