Question

timothy recorded the monthly change in his savings account balance, in dollars, for 8 months.

what is the average monthly change in timothys savings account balance?

enter your answer in the box

Explanation:

Step1: Sum up all balance changes

$$\begin{align*} &(-30)+(-15)+55 + 40+(-20)+(-45)+(-10)+65\\ =&(-30 - 15-20 - 45-10)+(55 + 40+65)\\ =&(-120)+(160)\\ =&40 \end{align*}$$

Step2: Calculate the average

The number of months \(n = 8\). The average formula is \(\text{Average}=\frac{\text{Sum of values}}{\text{Number of values}}\). So \(\text{Average}=\frac{40}{8}\)

Answer:

\(5\)