SOLUTION:
To find the mean loss per month, we use the formula:
![\[\text{Mean loss per month} = \frac{\text{Total loss}}{\text{Number of months}}\]](https://img.qammunity.org/2024/formulas/business/high-school/pr2mvhjrpcnbgm5y0vciuypeldzkyr8iv9.png)
Given that the store lost a total of $18000 in June, July, and August, the total loss is $18000. Since the loss occurred over a period of three months, the number of months is 3. Plugging these values into the formula, we get:
![\begin{aligned}\[\text{Mean loss per month}& = (18000)/(3)\\& = \boxed{6000}\]\end{aligned}](https://img.qammunity.org/2024/formulas/business/high-school/vw36u6eyw7653ncyxxograzw6as7c3mzjb.png)
The mean loss per month for the store that sells ski equipment was $6000.
