Question

The arithmetic mean of the data (x,f) : (8,5),(10,8),(15,8),(20,4) is

Answer 1

We know AM= sum(xi.fi)/sum(fi)
therefore here, sum(xi.fi)=40+80+120+80=320
and sum(fi)=5+8+8+4=25
therefore AM= 320/25=12.8


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