137
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The mean (average) of 76, 63, 79, 63, and 74 is 71.
No, 63 and 74 are not relatively prime because they have a common factor of 1.
6 plus 6 plus 63 plus 63 plus 36 plus 36 is equal to 210.
50 + 63 + 72 + 63 + 137 + 172 = 557
24 + 63 = 87