So add all the numbers together (20 + 22 + 28 + 35 + 47 + 90) and you'll get 242. Then you take the number and divide it by the numbers in your set (you have 6 numbers so you'll divide by 6) 242/6. The answer would be 40.3333333 (repeating decimal). I hope this helps!
First, line them up from least to greatest. (20, 22, 28, 35, 47, 90). Now add all them up. 20 + 22 + 28 + 35 + 47 + 90 = 242. Now divide by how many numbers are in the set, (6). 242 / 6 = 40.
