1. Choose the correct answer from the given four options in the formula  x ¯   =   a   +   f i x i f i
For finding the mean of grouped data di's are deviations from a of
(a) lowers limits of the classes          (b) Upper limits of the classes
(c) Mid points of the classes             (d) Frequencies of the class marks
2. If mean off the distribution is 7.5 
X 3 5 7 9 11 13 F 6 8 15 P 8 4
Then P :-
(a) 2                 (b) 4                 (c) 3                    (d) 6

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