How to find mean if the distribution isclass marks 1-3 ,3-5 ,5-7 ,7-10Frequency 9 ,22, 27,17

How to find mean if the distribution isclass marks 1-3 ,3-5 ,5-7 ,7-10

1.	How to find mean if the distribution isclass marks 1-3 ,3-5 ,5-7 ,7-10Frequency 9 ,22, 27,17
Answer» Of Mean=sum fo (x*f)/sum fo (f)=304/75=4.0533