Question

The class marks of a frequency distribution are as 5, 10, 15, 20, 25,.... What is the class
corresponding to class mark 20?​

Answer 1

Answer:

ANSWER

Class marks are: 15,20,25,...

Lower limit of class 20 is mean of 15 and 20=

2

15+20

=17.5

Upper limit of class 20 is the mean of 20 and 25=

2

20+25

=22.5

20 is the class mark for the class interval 17.5−22.5