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Basic Math Examples
80 , 75 , 78 , 80 , 92 , 66 , 70 , 78 , 68 , 90 , 78
Step 1
The mean of a set of numbers is the sum divided by the number of terms.
80+75+78+80+92+66+70+78+68+90+7811
Step 2
Step 2.1
Add 80 and 75.
155+78+80+92+66+70+78+68+90+7811
Step 2.2
Add 155 and 78.
233+80+92+66+70+78+68+90+7811
Step 2.3
Add 233 and 80.
313+92+66+70+78+68+90+7811
Step 2.4
Add 313 and 92.
405+66+70+78+68+90+7811
Step 2.5
Add 405 and 66.
471+70+78+68+90+7811
Step 2.6
Add 471 and 70.
541+78+68+90+7811
Step 2.7
Add 541 and 78.
619+68+90+7811
Step 2.8
Add 619 and 68.
687+90+7811
Step 2.9
Add 687 and 90.
777+7811
Step 2.10
Add 777 and 78.
85511
85511
Step 3
Divide.
77.¯¯¯¯72
Step 4
The mean should be rounded to one more decimal place than the original data. If the original data were mixed, round to one decimal place more than the least precise.
77.7