1940 randomly selected adults were asked if they think they are financially better off than their parents. The following table gives the two-way classification of the responses based on the education levels of the persons included in the survey and whether they are financially better off, the same as, or worse off than their parents.
Better off
150
430
430
Same
40
240
110
Worse off 180
310
50
Find the joint probability of the events "worse off" and "better off".
worse off and better off)=