题目
The joint probability distribution of random variables X and Y is given by f(x,y) = k× x×y for x =1,2,3,y =1,2,3, and k is a positive constant. What is the probability that X+Y will exceed 5?
选项
A.1/9
B.1/4
C.1/36
D.Cannot be determined
答案
B
解析
「huixue_img/importSubject/1564169386435153920.png」