Question

find the class marks and class size of interval 15-20

Answer 1

class size is (20-15)=5
class mark is (20+15)/2=27.5

Answer 2

hey the answer is ....

class size- - UCL - LCL

= 20 - 15 = 5


class mark -- UCL + LCL/2
=20 + 15/2
= 35/ 2
= 17.5


hope it helps uu frnd