2025年12月美国B卷 · 第 10 题

2025年12月美国B卷 · 原库模块 1 · Q10 原库参考解析

Rattlesnakes do not lay eggs but give birth to live young. For the last three years, a rattlesnake at a zoo gave birth to one litter per year. The table shows the number of rattlesnakes in each of these three litters.

What is the mean number of rattlesnakes per litter for these three litters?