Question

If class mark of particular class is 15
and class size is 10, then class
internal is
o a. 5-10
O b. 10-20
O c. 15-25
o d. 15-20​

Answer 1

b. 10-20

is the correct answer

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Answer 2

Class interval is 10 - 20. (option b)

Given :

Class mark = 15

Class size = 10

To find :

Class interval

Solution :

To find the class interval we need to determine the upper limit and the lower limit;

Class size = Upper limit - Lower limit

⇒ 10 = Upper limit - Lower limit  -----> eq 1.

2 x Class mark =  Upper limit + Lower limit

⇒ 30 = Upper limit + Lower limit ------> eq 2.

eq 1 + eq 2 ⇒ 40 = 2 x Upper limit

                  ⇒ Upper limit = 40/2 = 20

From eq 1, Lower limit = Upper limit - 10

             ⇒ Lower limit = 20 -10 = 10

Therefore, the class interval = 10 - 20

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