Exemplar Exercise Problem I — task. Mathematics CBSE, Class 10.

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1. In the formula \(\overline X = a+\frac{\sum f_id_i}{\sum f_i}\) for finding the mean of grouped data \(d_i’s\) are deviations from \(a\) of

frequencies of the class marks
mid points of the classes
lower limits of the classes
upper limits of the classes

2. While computing mean of grouped data, we assume that the frequencies are

centred at the lower limits of the classes
centred at the classmarks of the classes
evenly distributed over all the classes
centred at the upper limits of the classes

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