The records of an Italian shoe manufacturer show that 20% of the shoes are defective. Assume that selection of shoes follow a Bernoulli trial.

[Ahmad Asif Arifeen]

The records of an Italian shoe manufacturer show that 20% of the shoes are defective. Assume that selection of shoes follow a Bernoulli trial.

a. If a manufacturer inspects 15 shoes randomly, what is the probability that at most two shoes are defective?
b. If a manufacturer wants to find 6 non defective shoes, what is the probability that 12 shoes have to be inspected?
c. Find the expected number of inspected shoes to find 6 non defective shoes.

 

[HallsofIvy]

You seem to be misunderstanding what this forum is for. It is to help with mathematics problems, not to do them for you! If you were given a problem like this, and the other one you posted as class work, you must have been given some instruction in this. Show what you do understand about it and what you can do yourself so that we will know what help you need.