Question

if the class marks of a frequency distribution table are 9.5,16.5,23.5,30.5 then find the class interval corresponding to class mark 16.5

Answer 1

Given class marks xi are
x1=9.5,
x2=16.5
x3=23.5
Class size=h=x2-x1
=23.5-16.5
=7
Class interval of 16.5 = (x2-h/2, x2+h/2)
=(16.5-3.5 , 16.5+3.5)
=13-20