Consider the following grouped frequency distribution x f 0 10 8 10 20 12 20 30 10 30 40 P 40 5...........

Quantitative Aptitude (CDS) Statistics

Consider the following grouped frequency distribution:

If the mean of the above data is 25.2, then what is the value of p?

Mean = (sum of fixi )/ (sum of f) = (8*5 + 12*15 + 10*25 + P*35 + 9*45) / (8+12+10+P+9) = 25.2

(875 + 35P)/(39+P) = 25.2

P = 11

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