Question

find the class size and class marks of the interval 20-30

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Answer 1

Answer:

Class mark is the average of upper limit and lower limit of the given class interval.

Therefore, class mark of 20−30 interval is  

2

20+30

​  

=  

2

50

​  

=25

Class mark of 10−20 interval is  

2

10+20

​  

=  

2

30

​  

=15

Step-by-step explanation:

Answer 2

Answer:

Class size= 10 (Class size= upper limit - lower limit)

Class marks= 25 (Class marks= (upper limit + lower limit)/2)

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