Question

Find mean of the following distribution :

Class	1-3	3-5	5-7	7-10
Frequency	9	22	27	17

Answer 1

Thus, arithmetic mean (\(\overline { x }\)) = \(\frac { { \Sigma f }_{ i }{ x }_{ i } }{ { \Sigma f }_{ i } }\) 

= \(\frac { 412.5 }{ 75 }\) = 5.5