Question

In the mass production of bolts it is found that 5% are defective. Bolts selected at random and put into
packets of ten. A packet is selected at random. Find the probability that it contains
(a) three defective bolts.
(b) less than three are defective.
Two packets are selected at random.
(c) Find the probability that there are no defective bolts in either packet.

8 years ago