The average is 19.
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Average= All of your numbers added together divided by how many numbers you have. 13+17=30 30/2=15
To find the average of a set of numbers, you add all the numbers together and then divide by the total number of values. In this case, the sum of 18, 12, 13, and 17 is 60. Since there are 4 numbers in the set, you divide 60 by 4 to find the average, which is 15.
27
The number halfway between 13 and 21 can be found by taking the average of the two numbers. Add 13 and 21 together to get 34, then divide by 2 to get 17. Therefore, the number halfway between 13 and 21 is 17.
How are we supposed to answer this without the numbers? 27: 2 (+7=) 9 (-4=) 5 (+8=) 13 (-3=) 10 (+9=) 19 (-2=) 17 (+10=) 27 (-1=) 26