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For each number $$x$$ in a list of numbers with mean $$m$$, the squared deviation of $$x$$ from the mean is defined as $$(x-m)^2$$. The variance of the numbers in the list is defined as the mean of the squared differences.
Quantity A
The variance of the numbers 3, 9, and 15
Quantity B
9 times the variance of the numbers 1, 3, and 5
C显示答案
· 相关考点
5.2.9 标准差
5.2.9 标准差
以上解析由 考满分老师提供。
