Probability and conditional probability · 第 5 题

Probability and conditional probability · 原库模块 1 · Q5 原库参考解析

The table summarizes the distribution of age and assigned group for 90 participants in a study.

One of these participants will be selected at random. What is the probability of selecting a participant from group A, given that the participant is at least 10 years of age? (Express your answer as a decimal or fraction, not as a percent.)