Question

Membership to a national running club is shown in the table which answer describes the average rate of change from year 3 to year 5?

Membership increased by an average of 6,600 people per year from year 3 to year 5

Membership decreased by an average of 6,600 people per year from year 3 to year 5

Membership decreased by an average of 13,200 people per year from year 3 to year 5

Membership increased by an average of 13,200 people per year from year 3 to year 5

Answer 1

"Membership decreased by an average of 6,600 people per year from year 3 to year 5"

Explanation:

To get average rate of change from year 3 to year 5, we need to divide the change from year 3 to 5 by 2 (because from year 3 to 5 is 2 years).

THe change is:

83.6 - 96.8 = -13.2

We divide by 2 to get per year average rate of change:

-13.2 / 2 = -6.6

In thousands, that is 6600 decrease.

2nd answer choice is right.