One reason the number 89 does not belong is because it is a Prime number and the other numbers are not.
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89%you do[100 x 0.89] and that equals the number 89, therefore the percent would be the decimal...its 89%
89% = 0.89 or 89/100
The average is 89.
Nope - 81 is a square number, and the next one is 100. 89 is actually a PRIME number