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A '''mean average''' is when you add up all a set of numbers and divide by how many of numbers were added. ===About a Mean Average===: A '''mean average''' is used in science to reduce the effects of [[Random Error|random errors]] in the [[results]] of an [[experiment]]. ===Calculating a Mean Average===Results: 5,3: <math>Average = \tfrac{5+3}{2}</math>: <math>Average = 4</math> Results: 7.0, 6.8, 7.8: <math>Average = \tfrac{7.0+6.8+7.8}{3}</math>: <math>Average = 7.1</math> Results: 12.3, 11.7, 11.4, 12.1: <math>Average = \tfrac{12.3+11.7+11.4+12.1}{4}</math>: <math>Average = 11.875</math>In science the answer should be rounded to the same number of [[Significant Figures|significant figures]] as the original numbers .: <math>Average = 11.9</math> ===Examples==={| class="wikitable"|-|[[File:ResultsTableCalculation.png|center|400px]]| style="height:20px; width:200px; text-align:center;" |The [[Mean Average|average]] for each set of [[results]] can be calculated by adding a row together and divide dividing by the number of [[results]] in that row.|} ==Key Stage 4=====Meaning===A '''mean average''' is when you add up a set of numbers and divide by how many of numberswere added.