Class: | $$3-5$$ | $$5-7$$ | $$7-9$$ | $$9-11$$ | $$11-13$$ |
Frequency: | $$5$$ | $$10$$ | $$10$$ | $$7$$ | $$8$$ |
$$C.I$$ | $$F_i $$ | $$x_i$$ | $$x_iF_i $$ |
$$ 3 - 5$$ $$5-7$$ $$7-9$$ $$9-11$$ $$11-13$$ | $$5$$ $$10$$ $$10$$ $$7$$ $$8 $$ | $$ 4$$ $$6$$ $$8$$ $$10$$ $$12$$ | $$20$$ $$60$$ $$80$$ $$70$$ $$96 $$ |
$$\displaystyle\sum F_i=40$$ | $$ 326$$ |