Question

Angelina's Italian Restaurant has collected data about customer sauce orders. It calculated that P(pesto) = 0.42, P(alfredo) = 0.86, and P(pesto or alfredo) = 0.93. Determine the P(pesto and alfredo).

Answer 1

In the customers, there are some people that will choose pesto and alfredo together. Then, if you add P(pesto) and P(alfredo) directly to calculate the P(pesto or alfredo) you will add the P(pesto and alfredo) twice. So the P(pesto and alfredo)= 0.42+0.86-0.93=0.35.