单选题 Which of the following is a discrete random variable? A. The amount of time between two successive stock trades. B. The realized return on a corporate bond. C. The number of advancing stocks in the DJIA in a day.

【正确答案】 C

【答案解析】Since the DJIA consists of only 30 stocks, the answer associated with it would be a discrete random variable. Random variables measuring time, rates of return and weight will be continuous.