Final answer:
To calculate the average monthly sales, find the sum of the monthly sales and divide it by the number of months.
Step-by-step explanation:
To calculate the average monthly sales for the given period, we need to find the sum of the monthly sales and then divide it by the number of months.
Feb: 18
Mar: 16
Apr: 15
May: 18
Jun: 20
Jul: 21
Aug: 23
Sum of sales = 18 + 16 + 15 + 18 + 20 + 21 + 23 = 131
Average monthly sales = Sum of sales / Number of months = 131 / 7 = 18.7143
Therefore, the average monthly sales for this period is approximately 18.71 units.