Zack is a very busy professional DJ. He keeps track of how many of each kind of event he works. sweet sixteen parties 20
anniversary parties 9
bar mitzvahs 6
corporate parties 1
bat mitzvahs 9

What is the probability that one of the events Zack worked last year, selected at random, was a bar mitzvah?

Write your answer as a fraction or whole number.

P(bar mitzvah) =