Question

5 Find the mean of the marks obtained by 30 students of class IX of a school given in example 2. ​

Answer 1

The marks obtained by 30 students in a class assessment of 5 marks is given below :

Marks 0 1 2 3 4 5

Number of Students 1 3 6 10 5 5

Calculate the mean, median and mode of the above distribution.

Answer 2

$\huge \underline \pink{Answer}$

$\bf{Now \: \overline{x} \: = \frac{x_1 \: + \: x_2 .... \: + x_3\:_0}{30} }$

$\bf \qquad \ \displaystyle \sum \limits_{i = 1}^{30}i_2 \: = 10 + 20 + 36 + 92 + 95 + 40 + 50 + 56 + 60 + 70 + 92 + 88$

$\bf\qquad80 + 70 + 72 + 36 + 40 + 36 + 40 + 92 + 40 + 92 + 40 + 50 + 50$

$\bf \qquad56 + 60 + 70 + 60 + 60 + 88 \: = \: 1779$

$\bf \qquad \overline{x} = \cancel\frac{1779}{30} = 59.3$