Question

six out of every 400 cans of paint are found to be defective. If you buy four cans of paint,what is the probability that one can will be defective.

Answer 1

prob of defect = 6/400 = 3/200

so prob that 1 out of 4 cans is defective
= C(4,1) (3/200)^ (197/200)^3 = appr .057