While computing the mean of grouped data, we assume that the frequencies are ____ at the class-marks of the classes.

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Detailed Solution

While computing the mean of grouped data, we assume that the frequencies are centered at the class-marks of the classes.
Mean of the data can be computed by adding all the observations then dividing the sum by the number of observations.
When the data is grouped from the ungrouped data, all the observations within the lowest and the highest limits are taken in the group and then mid-value is considered for calculations. So, the frequencies are centered at the class marks of the classes.
Therefore, frequencies are centered at the class-marks of the classes.

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