A manufacturing machine has a 10% defect rate. If 7 items are chosen at random, what is the probability that at least one will have a defect?

Respuesta :

Probability at least one will have a defect = 1 - probability (none will have a defect) = 1 - C(7,0) (0.03)^0 (0.97)^7 = 1 - 0.808 = 0.192.