Basic Math Examples

Find the Mean 84 , 83 , 78 , 79 , 83 , 81 , 85
84 , 83 , 78 , 79 , 83 , 81 , 85
Step 1
The mean of a set of numbers is the sum divided by the number of terms.
84+83+78+79+83+81+857
Step 2
Simplify the numerator.
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Step 2.1
Add 84 and 83.
167+78+79+83+81+857
Step 2.2
Add 167 and 78.
245+79+83+81+857
Step 2.3
Add 245 and 79.
324+83+81+857
Step 2.4
Add 324 and 83.
407+81+857
Step 2.5
Add 407 and 81.
488+857
Step 2.6
Add 488 and 85.
5737
5737
Step 3
Divide.
81.85714285
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.
81.9
 x2  12  π  xdx