Question

Please help this is a very important test for me.

Andrea is a very good student. The probability that she studies and passes her mathematics test is 17/20. If the probability that Andrea studies is 15/16, find the probability that Andrea passes her mathematics test, given that she has studied.

Answer 1

68/75 or .907

Explanation:

"P(studies and passes)= 17/20

P(studies) = 15/16

P(passes/studies) = x

P(studies and passes) = P(studies) x P(passess/studies)

17/20 = 15/16 x X

68/75 or .907"