Question

The class marks of a frequency
distribution are given as follows:15,
20, 25, ... The class corresponding to
the class mark 15 is 12.5 - 17.5​

Answer 1

Answer:

Step-by-step explanation: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

Answer 2

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