Question

A student goes to the library. The probability that she checks out a fiction book is 0.45, a work of non-fiction book is 0.28, and both fiction and non-fiction book is 0.10. What is the probability that the student checks out a fiction or non -fiction book ?

Answer 1

0.63

Explanation:

You have to add the probability for a fiction and the probability for non-fiction

0.45+0.28=0.73

Then you have to subtract the probability for both

0.73-0.10=0.63