Question

Compute the median from the marks obtained by the students of class X
Marks
40-49 50-59 60-69
70-79 80-89
90-99

No.Student 20
30
20
15​

Answer 1

Step-by-step explanation:

c.i( class interval): 40-49, 50-59, 60-69, 70-79

fi( frequency): 20, 30, 20, 15

c.f( class frequency): 20, 20+30=50, 50+20=70, 70+15= 85

n=85

n/2=85/2=42.5

median= l+(n/2-c.f/f)*h

=50+(85-20/30)*9

=50+(65/30)*9

=50+(585/30)

=50+19.5

=69.5