单项选择题

A portfolio manager is looking at an investment that has an expected annual return of 10% with a standard deviation of annual returns of 5%. Assuming the returns are approximately normally distributed, the probability that the return will exceed 20% in any given year is closest to:

A. 0.0%.
B. 4.56%.
C. 2.28%.

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单项选择题A probability function:

A. only applies to continuous distributions.
B. specifies the probability that the random variable takes on a specific value.
C. is often referred to as the "cdf. "

单项选择题A nursery sells trees of different types and heights. Suppose that 75 pine trees are sold for planting at City Hall. These 75 trees average 60 inches in height with a standard deviation of 16 inches. Using this information, construct a 95 percent confidence interval for the mean height of all trees in the nursery:

A. 60±1.96(16).
B. 0.8±1.96(16).
C. 60±1.96(1.85).