4 A pottery manufacturer makes teapots in batches of 50. On average 3\% of teapots are faulty.
- Find the probability that in a batch of 50 there is
(A) exactly one faulty teapot,
(B) more than one faulty teapot. - The manufacturer produces 240 batches of 50 teapots during one month. Find the expected number of batches which contain exactly one faulty teapot.