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Finding Mean for Grouped Data When Class Intervals Are Not Given

The distribut...

Question

The distributions X and Y with total number of observations 36 and 64,and mean 4 and 3 respectively are combined.What is the mean of the resulting distribution X+Y?

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Solution

Number of observations in X=36 and Mean=4

Number of observations in Y=64 and Mean=3

Therefore Mean of the distribution X+Y=(36×4+64×3)/(36+64)

=(144+192)/100

=336/100=3.36

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Finding Mean for Grouped Data When Class Intervals Are Not Given

Standard X Mathematics

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