Judging from recent experience, 5 percent of the computer keyboards produced by an automatic, high-speed machine are defective. What is the probability that out of six keyboards selected at random, exactly zero keyboards will be defective?
A) 0.001
B) 0.167
C) 0.735
D) 0.500

Question

Quizplus · Accepted Answer

The probability that a keyboard is not defective is 95% or 0.95. For exactly zero keyboards to be defective out of six selected at random, all six must be non-defective. The probability of this happening is $0.95^6 \approx 0.735$.

Judging from Recent Experience, 5 Percent of the Computer Keyboards