Use the addition rule or multiplication rule for probability.
-A recent survey of local cell phone retailers showed that of all cell phones sold last
Month, 64% had a camera, 28% had a music player and 22% had both. The probability
That a cell phone sold last month had a camera or a music player is
A) .22
B) .70
C) .92
D) .30
E) .08

Question

Quizplus · Accepted Answer

The probability of a cell phone having a camera or a music player is calculated using the addition rule: P(A or B) = P(A) + P(B) - P(A and B). Thus, 0.64 + 0.28 - 0.22 = 0.70.

Use the Addition Rule or Multiplication Rule for Probability