Halfway between them is 69.
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43 47 53 59 61 67.
(59 + 71) / 2 = 65
All the prime numbers between 50 and 75 are 53, 59, 61, 67, 71 and 73.
find varience fo rthis numbers 71, 67, 70, 59, 71, 68, 67, 71, 80, 68, 74, 69, 72, 68.
67.6363