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One reason the number 89 does not belong is because it is a prime number and the other numbers are not.
It is a natural (or counting) number, a whole number, an integer, a rational number, and a real number.
Prime and odd are the only ones I could think of
8 numbers, so the median is the mean average of the 4th and 5th numbers. 4th number is 86 5th number is 86 median = (86 + 86) ÷ 2 = 86.
1, 2, 43, 86.