Let A1 = The land has oil
A2 = Land has no oil
B1 = Test Predicted that land has oil
B2 =Test Predicted that land has no oil
Required probability = P(A1/B2)
A1 and A2 are mutually exclusive and exhaustive. Hence we can use Baye theorem
P(A1/B2) = P(A1B2)/P(B2) =

