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Mode for unequal class length


Feb 21, 2013
How to find mode for grouped frequency distribution with unequal class length? I have to find the mode for the following problem:

Marks No of students

0-20 32
20-50 45
50-70 15
70-100 8

For equal class length, we use the formula

\(\displaystyle Mode= l+\frac{f_0-f_{-1}}{2f_0-f_{-1}-f_{+1}}\)

But how to proceed for the above example?