Well, let's take a moment to appreciate these numbers, each one unique and special in its own way. To find the mean, we add them all together and then divide by how many numbers there are. So, by adding 60 + 72 + 80 + 80 + 98 and dividing by 5, we find that the mean is 78.
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3528 28 = 22 x 7 72 = 23 x 32 98 = 2 x 72 lcm = 23 x 32 x 72 = 3528
72.......107-98(9) 98-90(8) 90-83(7) 83-77(6) 77-[72](5) 72-68(4) 65
98 = 100 - 280 x 100 = 8,000 80 x 2 = 160 8,000 - 160 = 7,840
5
it add 26