Question

If you select a month at random from a leap year, what is the probability that the selected month will have an even number of days?

Answer 1

Answer:

5/12

Step-by-step explanation:

First, list the months by the number of days each has:

Jan:  31, Feb:  28 or 29, Mar:  31, Apr:  30, May:  31, Jun:  30, Jul:  31, Aug:  31, Sep:  30, Oct:  31, Nov:  30, Dec:  31.

How many of these 12 months have an even number of days?

Feb, Apr, Jun, Sep, Nov (assuming that we ignore Leap Year):  5 months

Then the probability that the selected month will have an even number of days is

5 months

--------------- = 5/12

12 months