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While finding arithmetic mean for 50 scores of an ungrouped frequency distribution it was given that Σ fi.xi = 755. Find the mean of the scores.

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Number of observations = 50 

Sum of observations = Σfixi = 755

Mean = \(\frac {\sum f_ix_i}{\sum f_i} = \frac {755}{50} = 15.1\)

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