280
Mean, which is the same as average, is the sum of the numbers divided by the quantity of the numbers: (280 + 280 + 250 + 320 + 270) ÷ 5
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The only perfect square between 250 and 280 is 256, which is equal to ±16 squared.
265 250 why each is -15 of number before
If you mean: 280,647 then it is an odd number
not as an exact number can go into 270 or 280 27 times with 5 remaining 275 / 10 = 27.5
85% of 280= 85% * 280= 0.85 * 280= 238