The following table gives the number of branches and number of plants in the garden of a school.


No. of branches (x):



2



3



4



5



6



No. of plants (f):



49



43



57



38



13


Let the assumed mean (A) = 4


No. of branches (xi)



No. of plants (fi)



ui = xi - A = xi - 4



fiui



2



49



-2



-98



3



43



-1



-43



4



57



0



0



5



38



1



38



6



13



2



26




N = 200




fiui = -77



Average number of branches per plant = A +


= 4 + =


= 3.62 (approx.)


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