An analyst does research about common probability. A return distribution has a mean of 1.8% and a variance of 2.25. If returns are normally distributed, the probability of observing a return value less than -1.2% is closest to:（）
A: 1.0%
B: 2.5%
C: 5%
A: 1.0%
B: 2.5%
C: 5%
举一反三
- In a continuous probability distribution, the random variable: A: is limited to certain values. B: may be any value within a certain range. C: may have a probability greater than 1.00. D: is discrete.
- For any normal distribution, any value less than the mean would have a _______.
- If the project completion time is normally distributed and the due date for the project is greater than the expected completion time, then the probability that the project will be finished by the due date is A: a. less than 0.50. B: b. greater than 0.50. C: c. equal to 0.50. D: d. undeterminable without more information.
- True or False: If a data set is approximately normally distributed, its normal probability plot would be S-shaped.
- The measurement of risk is measured by A: Mathematical expectation B: Variance C: Probability density function D: Cumulative distribution function