2025年9月国际A卷 · 第 19 题

2025年9月国际A卷 · 原库模块 2 · Q19 原库参考解析

For 100 neurons, the table summarizes the distribution of classification and cell body diameter.

One of these neurons will be selected at random. What is the probability of selecting a neuron with a cell body diameter that is less than or equal to 30 micrometers, given that it is not classified as a motor neuron? (Express your answer as a decimal or fraction, not as a percent.)