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Sum them : 340

Count them: 4 numbers

Divide sum by number of numbers = 340/4 = 85.

Alternatively, in this case, you may notice that the numbers are evenly spaced. The middle two numbers are 80 and 90 so halfway between then will be the overall mean. This only works for the arithmetic mean of evenly spaced numbers.

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Q: How do you find the average for 100 70 80 90?
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