Question

if class width is 8 and class mark is 12 then find class interval? plz explain​

Answer 1

class width ,w=8

class mark ,m= 12

let the class interval be x and y

m = (x+y)/2.......(1)

we also know that y-x=w

y=8+x

putting value in (1)

12=(x+x+8)/2

2x+8=24

2x=16

x=8

y=16

class interval 8-16