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Stats 2
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S1 Topic 2: Representation and summary of data
Calculate the mean backmore
You must know the formulae for calculating the mean average. Note that the sum of a set of numbers can be written in a number of forms:
sigma sum

For a set of numbers: mean
Some data: 6, 2, 9, 5, 7, 19

For a grouped frequency distribution: mean of grouped data
Some data:  
x 1 2 3 4 5
f 4 12 9 18 7

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