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The marks obtained out of 50, by 102 stu...

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

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