Question

2.The class marks of a frequency distribution
are as follows : 15, 20, 25, .... Find the class
corresponding to the class mark 20.​

Answer 1

Step-by-step explanation:

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