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You add up the numbers, then divide by how many numbers you added. Here there are 4 numbers to add up: 81+83+87+85. Use a calculator or do longhand. Then divide the sum by 4 to get the average.
86.90909090 recurring or 86 and one eleventh.
The integers are 81, 83, 85 and 87.
.8 .81 .82 .83 .84 .85 .86 .87 .88 .89 .9 There are many more numbers, even an INFINITE amount, between these two.
There are four consecutive odd integers: 81, 83, 85 and 87.