The marks obtained out of 50 , by 102 students in a Physics test are given in the frequency tabl...

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The marks obtained out of 50 , by 102 students in a Physics test are given in the frequency table below:
\( \begin{array}{lccccccccc}\text { Marks }(x): & 15 & 20 & 22 & 24 & 25 & 30 & 33 & 38 & 45 \\ \text { Frequency }(f): & 5 & 8 & 11 & 20 & 23 & 18 & 13 & 3 & 1\end{array} \)
Find the average number of marks.
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