The percentage of marks obtained by students of a class in mathematics are : 64, 36, 47, 23, 0, 19, 81, 93, 72, 35, 3, 1. Find their mean.

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Solution

Given that the percentage of marks obtained by students of a class of mathematics are 64, 36, 47, 23, 0, 19, 81, 93, 72, 35, 3, and 1. These are 12 in numbers.

We have to find the mean of their percentage of marks.

Remember the definition of mean of n values x₁, x₂… x_n is

Therefore the mean of their weights is

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0, 0, 2, 2, 3, 3, 3, 4, 5, 5, 5, 5, 6, 6, 7, 8

Marks:	10	20	30	40	50	60
Number of student	5	12	32	40	45	48

Marks obtained	0-10	10-20	20-30	30-40	40-50	50-60	60-70
No. of students	$2$	$10$	$12$	$15$	$13$	$8$	$4$

Given below are the marks (out of 100) in mathematics obtained by 40 students of Class VI in an annual examination.

Which section has arranged their marks in ascending order?

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