Question

1. Class mark and class size of the class interval are 25 and 10 respectively then the class interval is
(a) 20 - 30 (b) 30 - 40 (0) 40 - 50 (d) 50 - 60​
give me answer please in description

Answer 1

Class interval is (a) 20 - 30

• Class size of class interval = Upper Limit - Lower Limit

         Here in all options class size turns out to be 10 only.

• Class mark is defined as the mid value of each class interval.

         Calculating class mark of (a) = (20+30)/2

                                                         = 50/2

                                                         = 25

Therefore option (a) is correct.

Answer 2

Answer:

20-30

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