Add them together and divide by 2. (86+69)/2=155/2=77.5
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86+69+71+56=282 282/the amount of numbers you want to average, so 282/4 = 70.5 70.5 is the average of those four numbers.
241
The average is 89.
Add the numbers together and divide the sum by 10 to find the mean
The average is 86.