Last week you sold 30, 45, 50, 75, and 80 units each day of the week, in that order. on average, how many units did you sell per day? "

To find the average of a set of data, or more properly the mean of the set of data, we should add all of the values together and divide that number by the number by the amount of values.

30+45+50+75+80=280

280/5=56

Using the math above, we can see that on average, we sold 56 units per day.