2026年8月国际B卷 · 第 2 题

2026年8月国际B卷 · 原库模块 1 · Q2 参考答案

Each rock in a collection of 70 rocks was classified as either igneous, metamorphic, or sedimentary, as shown in the frequency table.

If one of these rocks is selected at random, what is the probability of selecting a rock that is igneous?