Ch7 Parmenter

Erica.Wheeler@uticanational.com
27 Aug 1998 12:58:02 +0100

I'm having a problem getting the answer for Chapter 7 - 4b.

There are four people aged 30. Find the probability that at least 2 of the
people will survive for at most 30 years.

Could someone explain to me how the answer in the back of the book is derived?

Thanks.
Erica