Originally Posted by

**ayato** Hi, can someone help me with this probability problem?

A publisher is printing a 1200 page book. The machinery is good but not perfect, printing an unintended blotch on average once every 100 pages. A book will be rejected if there are 20 or more pages with a blotch. In a production run of 10,000, about how many books do you expect will be rejected?

I was told the answer is 102 (probability 0.0102 of a book's rejection) but i just can't seem to work it out. Your help is ver appreciated, and thank you in advance.