25年12月国际C卷练习 · 第 22 题

25年12月国际C卷练习 · 原库模块 1 · Q22 原库参考解析

The weight of each object in two groups, A and B, was recorded. The histograms represent the distributions of weight, in grams, for the objects in groups A and B.

The mean weight of the objects in group A is equal to 2.9, and the mean weight of the objects in group B is equal to 7.9. Which of the following statements about the standard deviations of weight for the objects in these two groups is true?