请问怎样得到以下答案？ There is an investment which has a mean and standard deviation of 15% and 10% respectively. Assume it is a normal distribution, which of the following is False? a. The probability of getting a return less than 10% is about 16% b. The probability of getting a return greater than 5% is about 84% c. The probability of getting a return greater than 35% is about 2.5% d. The probability of getting a return between 5% and 25% is about 68 percent. How do I get answer a? Many thanks. | 
发表于 2008-4-26 15:01
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