What is the average (arithmetic mean) of the list of numbers above?
A. 20
B. 100
C. 20 +
D.
Answer:A
What is the average (arithmetic mean) of the list of numbers above?
A. 20 B. 100 C. 20 + D.
Explanation: A Variables in the answers? Plug in! Make up a value for x. Let's say that x is 3. The list of numbers then becomes 20 - 2(3), 20 - 3, 20, 20 + 3, 20 + 2(3), so the list is 14, 17, 20, 23, and 26. To find the average, make an average pie: We know the number of things (5) and the total (14 + 17 + 20 + 23 + 26 = 100), so the average is 100 ÷ 5 = 20, which is (A).