The average of a set of numbers is their sum divided by how many there are.
So, the average here is (250 + 310 + 275 + 195) / 4 and you can work that out.
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First, add up the four numbers you listed. 250 + 310 + 275 +195 would equal 1,030 There are 4 numbers in the list so, to get the average, you divide the total by 4. 1,030 divided by 4 would equal 275.50 :-) - Chris
(310 + 421 + 424) ÷ 3 = 385
310+205 of 310=310+ 20/100*310=310+62=372
310. If it was -310, it would still be 310.
10% of 310= 10% * 310= 0.1 * 310= 31