题目
Which of the following is a continuous random variable?
选项
A.The value of a futures contract quoted in increments of $0.05
B.The total number of heads recorded in 1 million tosses of a coin
C.The rate of return on a diversified portfolio of stocks over a three-month period
答案
C
解析
： C is correct. The rate of return is a random variable because the future outcomes are uncertain, and it is continuous because it can take on an unlimited number of outcomes. ： C是正确的。回报率是一个随机变量，因为未来的结果是不确定的，它是连续的，因为它可以有无限个结果。