Questions

Q1.

The probability of a bolt being faulty is 0.3. Find the probability that in a random sample of 20 bolts there

are

(a) exactly 2 faulty bolts,

(2)

(b) more than 3 faulty bolts.

(2)

These bolts are sold in bags of 20. John buys 10 bags.

(c) Find the probability that exactly 6 of these bags contain more than 3 faulty bolts.