what would be reasonable set of intervals to use for the number of hurricanes per season for the last 20 years, if you're going to use an interval greater than 1?

what would be reasonable set of intervals to use for the number of hurricanes per season for the last 20 years if youre going to use an interval greater than 1 class=
what would be reasonable set of intervals to use for the number of hurricanes per season for the last 20 years if youre going to use an interval greater than 1 class=