Question

The marks obtained by 120 students in a test are given below :

Marks	0-10	10-20	20-30	30-40	40-50	50-60	60-70	70-80	80-90	90-100
No.of students	5	9	16	22	26	18	11	6	4	3

Draw an ogive for the given distribution an a graph sheet. Use suitable scale for ogive to estimate the following : 

(i) The median. 

(ii) The number of students who obtained more than 75% marks in the test. 

(iii) The number of students who did test pass the test if minimum marks required to pass is 40.

Answer 1

(ii) Number of students who obtained more than 75% marks in the test 

= 120-110=10

(iii) Number of students who did not pass the test = 52