2 If there are 120 typographical errors randomly distributed

2. If there are 120 typographical errors randomly distributed in 200=page manuscript, find the probability that a given page contains exactly three errors.

Solution

Prob of error in one page = 120/200 = 0.6

Hence for a page prob of error is 0.6

For a page containing 3 error is

0.6³ ( as each error is indepdnent.)

= 0.216