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The average is 72. To compute the average, you add up the numbers and then divide by the amount of numbers you have. So, in this case: 0 + 84 + 87 + 91 + 98 = 360 360 divided by 5 = 72
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Add them up. 90, 91, 92, 93, 94, 95, 96, 98, 99, 100
To make the list of two-digit numbers with digits that add up to 10, first write the pairs of single-digit integers that add up to 10. They are (1,9), (2,8), (3,7), (4,6), (5,5). Then recognize that each of these pairs of numbers, except 5, can be combined in two different ways to make two-digit numbers that satisfy the problem. 19 and 91 28 and 82 37 and 73 46 and 64 55 So there are nine two-digit numbers with digits that add up to 10.
110