1.

Class: 0-10 & 10-20 & 20-30 & 30-40 & 40-50 Frequency: 12 & 28 & 32 & 25 & 13FIND MEAN BY USING DIRECT METHOD.

Answer»
Class IntervalClass Mark(xi)Frequency (fi)xifi
0-1051260
10-201528420
20-302532800
30-403525875
40-504513585
\(\Sigma x_i\) = 125\(\Sigma f_ix_i\) = 2740

\(\therefore\) Mean = \(\frac{\Sigma x_if_i}{\Sigma x_i}=\frac{2740}{125}\) = 21.92



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