What will be the class range if the mid value of a class range is 165 and the distance between classes is 30?

160 - 170

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150 - 180

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155 - 175

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140 - 190

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Solution

The correct option is B
150 - 180

The classes are at an interval of 30.

So, starting from 0 we get :

0-30 , 30-60 , 60-90 , 90-120 , 120-150 , 150-180 , ....and so on

165 lies in the interval 150-180 and it is the mid value of this class range.

( $\frac{150 + 180}{2}$ = 165 )

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