题目内容：
What are the benefits of sorting trash?
参考答案：
选择题：What are the benefits of sorting trash?
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-Wow! This is a marvelous room! You must spend a l
-Wow! This is a marvelous room! You must spend a lot of time and energy in it.-_
设x1,x2,x是来自N(u,2)的样本,则E((x-2)=i - 1 A ( n - 1 ) a
设x1,x2,x是来自N(u,2)的样本,则E((x-2)=i - 1 A ( n - 1 ) a 2 Ba 2
Did Molly agree to sort trash? Why?
Did Molly agree to sort trash? Why?
设随机变量X的概率分布为P(X=k)=bk,k=1,2,…,b>0,则()(A)λ为任意正实数;(
设随机变量X的概率分布为P(X=k)=bk,k=1,2,…,b>0,则()(A)λ为任意正实数;( B ) A =b + 1 ; ( C ) = 1/1 + b
契贝晓夫大数定律设2,是一列两两不相关的随机变量,又设它们的方差有界,即存在常数C>0,使有D≤C,
契贝晓夫大数定律设2,是一列两两不相关的随机变量,又设它们的方差有界,即存在常数C>0,使有D≤C,=1,2,则(n}随机变量序列服从大数定律,Ve > 0 ,