题干

What is Mario doing now?

A:Watching the birds.

B:Shooting the birds.

C:Drawing the birds.

上一题 下一题 0.0难度 选择题 更新时间:2017-11-13 12:37:02

答案(点此获取答案解析)

B

同类题4

若随机变量x的分布列如下表所示,设h = 2x + 3,则h的期望值为
x
-1
0
1
P


a