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The class mark of the median class of the following data is :
begin{tabular}{|l|c|c|c|c|c|c|}
hline Class Interval & $10-25$ & $25-40$ & $40-55$ & $55-70$ & $70-85$ & $85-100$
hline Frequency & $2$ & $3$ & $7$ & $6$ & $6$ & $6$
hline
end{tabular}
begin{tabular}{|l|c|c|c|c|c|c|}
hline Class Interval & $10-25$ & $25-40$ & $40-55$ & $55-70$ & $70-85$ & $85-100$
hline Frequency & $2$ & $3$ & $7$ & $6$ & $6$ & $6$
hline
end{tabular}
- (a)$40$
- (b)$55$
- (c)$47.5$
- (d)$62.5$
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Answer : (D) $62.5$