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No, you do not. To find the mean, do the following steps:

1) Add all the numbers in the given set together.

2) Count up how many numbers are in the set (or which you have just added.)

3) Divide the sum from Step One by the amount of numbers in the set. The quotient will be your mean.


Here is an example:


1) Find the mean of this set: 1, 2, 5, 10. Show your work.


1+2+5+12=20

20/4= 5


5 is the mean.


A second example that's a word problem:


2) Mark's school year is nearly ending. He has a collection of all his tests in Math, and wants to know his Math average early. The scores seen are the following: 90, 98, 80, 89, 100, 100, 95, 96, 85. Find the average of Mark's tests. Show your work.


90+98+80+89+100+100+95+96+85= 833


833/9=92.5 with the 5 repeating (shown by a bar over the 5 or as 5/9)

This means that the mean can be shown as exact as 92.5 with the five repeating or 92 5/9. If you can round, then it would round up to 93.

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12y ago

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