假设随机变量X在[-1，1]上服从均匀分布，a是区间[-1，1]上的一个定点，Y为点
题型：填空题
问题：
假设随机变量X在[-1，1]上服从均匀分布，a是区间[-1，1]上的一个定点，Y为点X到a的距离，当a=______时，随机变量X与Y不相关．
题型：填空题
| 根据图片及所给信息对号入座。 | |
( ) | a. We give beautiful flowers to our teachers on Teachers' Day. |
( ) | b. The cat is the first in the race. The dog is the second. The panda is the third. |
( ) | c. I write on the blackboard with the chalk. |
( ) | d. It's rainy today. I'm at home. |
( ) | e. The wind blows, he leaves off the tree. |