It is a natural (or counting) number, a whole number, an integer, a rational number, and a real number.
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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.
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.
86 = 2 x 43
It is 2 because the prime numbers of 86 are 2 and 43
86 is an integer and there s no sensible representation of integers as mixed numbers.