Class Interval Frequency 110 115 10 115 120 15 120 125 18 125 130 20 130 135 14 Find the class mark for the class interval 115 120.

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Class Mark, Class Limit and Class Size

Class - Inter...

Question

117.5

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117

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118

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118.5

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Solution

The correct option is A 117.5
Class Mark is is obtained by adding the two limits and dividing by 2.

Class Mark = $\frac{(115 + 120)}{2}$
= 117.5

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