Question

The amounts below show the change (measured in feet) in water level over four months. What is the average monthly change in water level?

3/4, -9/4, -11/4, 5/4

Answer 1

The average change in water level is: -3/4

Explanation:

The average is calculated by adding up all the values and then dividing the sum by total number of values.

Given values are:

3/4, -9/4, -11/4, 5/4

The sum of values will be:

`=(3)/(4)+(-(9)/(4))+(-(11)/(4))+(5)/(4)\\=(3)/(4)-(9)/(4)-(11)/(4)+(5)/(4)\\=(3-9-11+5)/(4)\\=(-12)/(4)\\=-3`

Total number of values is 4

So,

`Average = (Sum)/(Values)\\= (-3)/(4)`

Hence,

The average change in water level is: -3/4