Question

8. Find the class mark and class size of the class interval 15-20.​

Answer 1

Class size=20-15 =5

Class mark= 20+15/2=17.5

Answer 2

It is given by ,

♠a= lower limit

♠b= upper limit.

Therefore , the class size and class mark of class is,

b-a = 20-15 = 5

Hope it helps you...