Contents
Key Stage 3
Meaning
A mean average is when you add up all the numbers and divide by the number of numbers.
About a Mean Average
- A mean average is used in science to reduce the effects of random errors in the results of an experiment.
Calculating a Mean Average
Results: 5,3 \[Average = \tfrac{5+3}{2}\] \[Average = 4\]
Results: 7.0, 6.8, 7.8 \[Average = \tfrac{7.0+6.8+7.8}{3}\] \[Average = 7.1\]
Results: 12.3, 11.7, 11.4, 12.1 \[Average = \tfrac{12.3+11.7+11.4+12.1}{4}\] \[Average = 11.875\] In science the answer should be rounded to the same number of significant figures as the original numbers. \[Average = 11.9\]
Examples
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The average for each set of results can be calculated by adding a row together and dividing by the number of results in that row. |