Example Problem I — task. Mathematics CBSE, Class 10.

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The marks obtained by

$30$ students of Class X of a certain school in a Mathematics paper consisting of

$100$ marks are presented in table below. Find the mean of the marks obtained by the students.

Marks obtained ( $x_i$ )	$10$	$20$	$36$	$40$	$50$	$56$	$60$	$70$	$72$	$80$	$88$	$92$	$95$
Number of students ( $f_i$ )	$1$	$1$	$3$	$4$	$3$	$2$	$4$	$4$	$1$	$1$	$2$	$3$	$1$

The mean of the marks obtained by the students

$=$

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1. Example Problem I