Suppose in Example 4 that the manufacturing process produces 40 defective pens per 1,000, on average. What is the approximate probability that in the sample of 400 pens there are

(A) At least 10 and no more than 20 defective pens?

(B) 27 or more defective pens?

Data from Example 4

A company manufactures 50,000 ballpoint pens each day. The manufacturing process produces 50 defective pens per 1,000, on average. A random sample of 400 pens is selected from each day’s production and tested. What is the probability that the sample contains

At least 14 and no more than 25 defective pens?

33 or more defective pens?