44, 45, 46, 48, 49, 50, 51, 52 (including 52).
0.9808
51: 51, 102, 153, 204, 255. 52: 52, 104, 156, 208, 260.
Do the math... Not that hard. 51 Years.
52, 54, and 56. I would include 58, but the word 'between' means that it can not include the numbers on the ends (51 and 58).
The average of the numbers 51, 52, and 56 would be 53.
52
Any number between 19.231 and 19.607 meets that description.
3/52*13/51+1/52*12/51= .01923
52, 54, 55, 56, 57, 58
50 and 52 are the even numbers in this range, the odd numbers will be all the others, which is just the number 51.
The whole numbers between 47 and 53 are 48, 49, 50, 51, and 52, but there are infinitely many numbers, including 48.123 and 51 5/6.