Question

A manufacturer of metal pistons finds that on an average, 10% of his pistons are rejected because they are either oversize or undersize. What is the probability that a batch of 10 pistons will contain at least 2 rejects?

Answer 1

1. No.of pistons rejected/No.of pistons manufactured
2. 2/10
3. 1/5
4. therefore 1/5 is the probability of rejected pistons