The final exam of a discrete structures course consists of 5

The final exam of a discrete structures course consists of 50 true/false questions, each worth
2 points, and 25 multiple-choice questions, each worth 4 points. The probability that Linda
answers a true/false question correctly is 0.9, and the probability that she answers a multiplechoice
question correctly is 0.8. What is her expected score on the final?

Solution

The expected score of Linda:

50*2*0.9+25*4*0.8

=170