Question

The probability for a razor blade to be defective is 0.002. The blades are in packet of 10. The number of packets containing no defective blades in a stock of 10,000 packet is

Answer 1

the blades are in packet of 10,so the number of blades in 10,000 packets are =10000×10=100000,
the probability for a razor blade is 0.002,
so the number of defective blades are=100000×.002=200,
so the number of non defective blades are 100000-200=99800,
so the number of packets containing no defective blades are =99800÷10=9980,

Answer 2

Step-by-step explanation:

On an average packet containing 10 blades is likely to have

two defective blades. In a box containing 100 packets,

number of packets expected to contain less than two

defective blades is