The cumulative relative frequency for the class of $20 - 29$

90

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25

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115

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160

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Solution

The correct option is D $160$
Cumulative frequency is used to determine the number of observations that lie above (or below) a particular value in a data set.
So, $C . F$ for the class of $20 - 29$ will be:
$C . F = 40 + 50 + 70$
Therefore, $C . F = 160$ .

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