Question

In the proofs of a book of a certain publisher, it has been found that, on average, one page in 15 contains at least one misprint. An expert proof-reader checks a book of 486 full pages.
(b) Find the expectation and variance of the number of pages without a misprint in the final 300 pages.

Answer 1

expectation of number without misprints is (300 / 15) * 14 = 280

Answer 2

Thanks!