What is the class mark of the interval 15 - 20?

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Solution

Class-mark =Upper limit + Lower limit/2

(15+20)/2 =17.5

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Q. What is the cumulative mark for the class interval

12 - 15

class interval	6-9	9-12	12-15	15-18	18-21
mark	2	4	6	8	10

Look at the following table below.
$\begin{matrix} C l a s s i n t e r v a l & C l a s s m a r k 0 - 5 5 - 10 10 - 15 15 - 20 \end{matrix}$

The class-mark for the first and second class intervals are:

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What is the class mark of the interval 15 - 20?

Class-mark =Upper limit + Lower limit/2 (15+20)/2 =17.5

Class-mark =Upper limit + Lower limit/2

(15+20)/2 =17.5