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题目内容双击单词支持查询和收藏哦～
For each value $$x$$ in a list of values with mean $$m$$, the squared deviation of $$x$$ from the mean is defined as $$(x-m)^2$$. The variance of the values in the list is the mean of the squared deviations.
For two lists of values. T and U, the numbers of values are equal and the means of the values are equal, but the variances of the values are distinct. List W consists of the values in T and the values in U combined.
For two lists of values. T and U, the numbers of values are equal and the means of the values are equal, but the variances of the values are distinct. List W consists of the values in T and the values in U combined.
Quantity A
The sum of the variances values in T and U
Quantity B
The variance of the values in W
A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。
