Mean of data, 2,3,4,1,2,3,1,5,4,2,3,1,3,5,4,3,2,2,3,2
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See this math which I send
I am sure that now your doubt clear.
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mean = sum of all observations/no.of observations
sum of all observations is 55
no. of observations is 20
= 55/20
= 11/4
= 2.75
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