Question 464667
1) These events are not independent, because {{{P(studies  AND good grades)< >P(studies) * P(good grades)}}}.

2)  P(good grades| studies) = P(studies  AND good grades)/P(studies) = 0.52/0.6 = 13/15.

3) P(studies | good grades) = P(studies  AND good grades)/P(good grades) = 0.52/0.7 = 26/35.