Question

the class marks of a distribution are 15,20,25,30 find the class limits​

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

so the class marks be as

12.5-17.5

17.5-22.5

22.5-27.5 ............ and so on