Question

The class marks of a distribution are 5,10,15,20…30. The first class interval of the distribution is​

Answer 1

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

Step-by-step explanation:

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