In a particular state, a study was conducted to determine the relationship between X, the size of a family, and Y, the total number of pets in that family. The joint distribution of X and Y is displayed in the table that follows.
X 2 3 4 5 6
Y
0 .12 .12 .10 .02 .01
1 .03 .05 .08 .10 .04
2 .02 .03 .06 .07 .05
Find the mean number of pets in a family.
X 2 3 4 5 6
Y
0 .12 .12 .10 .02 .01
1 .03 .05 .08 .10 .04
2 .02 .03 .06 .07 .05
Find the mean number of pets in a family.