Mark the correct alternative in the following:

A box contains 100 pens of which 10 are defective. What is the probability that out of a sample of 5 pens drawn one by one with replacement at most one is defective?


Total pens=100

Defective pens=10


P(atmost one non-defective pen)=?

P(defective pens


P(atmost one non-defective pen)=p(x<10)


= 5C0 p0 q5+5pq4