4
79
The average is 89.
86
86
82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
86
There is no mode because all the numbers are different
no parts for a 89 go thru years 88 thru 91
All of the numbers appear once and as a mode is the most commonly occurring number, there is no mode.
8
No. 86-88 are the same. 89-91 are the same.
19 between the two numbers.