Find the mean from the following frequency distribution of marks at a test in statistics : \( \b...
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0Find the mean from the following frequency distribution of marks at a test in statistics :
\( \begin{array}{lcccccccccc}\text { Marks }(x): & 5 & 10 & 15 & 20 & 25 & 30 & 35 & 40 & 45 & 50 \\ \text { No. of students }(f): & 15 & 50 & 80 & 76 & 72 & 45 & 39 & 9 & 8 & 6\end{array} \)
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