Question
Let X be the number of people in a randomly selected household. The table gives the probabilities for household-size categories.
| Household size x | 1 | 2 | 3 | 4 | 5 | 6 | 7 or more |
|---|---|---|---|---|---|---|---|
| P(X = x) | 26.7% | 33.6% | 15.8% | 13.7% | 6.3% | 2.4% | 1.5% |
- Is
Xa discrete random variable? - Determine whether the table represents a discrete probability distribution. If it does not, explain why.
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Evidence boundary
题面和概率来自教材示例。答案仅判断题目给定的类别表；不把“7 or more”拆成未经来源支持的单个家庭人数概率。