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?

19/20

47/50

13/20

43/50

17/20

Question

Norah Roy

31 August, 16:28

+4

Answers (1)

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Harrison White · Answer 1

P (A or B) = P (A) + P (B) - P (A and B) P (A or B) = 0.7+0.55-0.3 P (A or B) = 0.4+0.55 P (A or B) = 0.95