There were 10 wet days in June last year. If the name of an individual is selected at random from a directory, write down the probability that his or her birthday last year was on a wet June day. Assume all birthdays are equally liked?

1 Answer
May 4, 2018

#2/73#

Explanation:

P(birthday on a wet June day)
= #10/365#
= #2/73#

There are 365 days in a year. So the probability of a person's birthday falling on a day is #1/365#. Since there are 10 wet days, the probability of a person's birthday falling on the wet days is #10 xx 1/365#