### Home > MC1 > Chapter 1 > Lesson 1.3.3 > Problem 1-123

Calculate the mean of each data set below. Can you find any shortcuts that allow you to find the mean without having to do a lot of calculation? 1-123 HW eTool (CPM).

You might have noticed there are an equal number of

's and 's. Can this help you find the mean more easily? The mean of these numbers is

. Because there are an equal number of 's and 's, the mean must be halfway between and . This should make calculations a bit simpler. The values that are not

are just one above and one below . With this knowledge, can you find a shortcut? Try adding together the numbers that are not zero in this set. Don't forget to divide the sum by

! The mean is

.

Use the eTool below to help you solve the problem.

Click the link at right for the full version of the eTool: MC1 1-123 HW eTool