一组数据1,3,2,5,x的平均数是3,则数据的方差为[ ]
A.4
B.100
C.2
D.10
答案:C
一件运动衣按原价的八折出售时,售价是40元,则原价为( )元。
Man: I really can’t afford any more interruptions right now. I’ve got to finish the assignment. Woman: Sorry. Just one more thing, could you give me a ride to school tomorrow Question: What can be inferred from the conversation().
A. The man will drive the woman to school.
B. The man has finished his assignment.
C. The man is willing to help the woman.
D. The man is losing patience with the woman.