Question

A company that manufactures smartphones makes 70% of the phones with a touch screen and 55% of the phones with HD movie capability. 30% of the phones have both a touch screen and HD movie capability. What is the probability that a smartphone chosen at random has either a touch screen or HD movie capability?

Answer 1

Using Rule of Addition:
It states that : "The probability that Event A or Event B occurs is equal to the probability that Event A occurs plus the probability that Event B occurs minus the probability that both Events A and B occur."

P(A or B) = P(A) + P(B) - P(A and B)
                 = 0.7 + 0.55 - 0.3
                 = 1.55

Answer 2

The answer is A. 19/20