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wmm93512 · 2022年04月29日

A是什么意思，为什么不对？

  1. CFA I
  2. Quantitative

NO.PZ2017092702000089

问题如下：

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

解释：

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.

收益率是一个随机变量，因为未来的结果是不确定且连续的。

A是什么意思，为什么不对？

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1 个答案

星星_品职助教 · 2022年04月30日

同学你好，

A选项意为 期货合约的价值每次按照0.05$递增，也就是1$只能涨到1.05$，1.10$，不可能出现1.01,1.1215这种。

由于增长不连续，很多值取不到，所以这是一个离散随机变量。

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