Add them altogether.
143+193+169+155+171+155 = 986
Now divide the sum by the amount of numbers you added, which is 6. You added 6 numbers to equal 986. 986/6=164.333. round that and you get 164. The mean of this group is 164
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25% of 169 = 42.25= 25% * 169 = 25%/100% * 169 = 0.25 * 169 = 42.25
The square root of 144 (12*12) and the square root of 169 (13*13).
The factors of 169 are: 1, 13, 169
The factors of 169 are: 1, 13, 169.
The divisors of 169 are 1, 13, and 169.