Data question (1 Viewer)

smithjohn

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A set of data has a mean of 4.25. When the outlier of 20 is removed, the mean changes to 3.2. How many scores are in the original data set?
 

nunyabeezwax

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let the number of data values be n
then the sum of all data values is 4.25n
4.25n - 20 = 3.2(n-1) = 3.2n - 3.2
1.05n = 16.8
n = 16.8/1.05 = 16
16 scores are in the original data set
 

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