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11 months have 29 days..........Only feb has 29 days in the leap year otherwise it has 28 days.
5 months don't have 31 days, 7 months do. February has 28, or 29 in leap years. April, June, September, and November have 30 days.
The average days in 9 months is 274 days. The exact answer to this question depends on the months in question, because some of the months may have 30 or 31 days or 28, or 29 days.
In the order they appear through the year, the months that have 31 days are:JanuaryMarchMayJulyAugustOctoberDecember
Some months have 30 days while others have 31 days because of the varying lengths of time it takes the earth to orbit the sun.