Answer :

Observe, here the class intervals are unequal but continuous. So, in order to find mean we need to simply find midpoints of the class intervals and further find fixi.

We can solve this using three methods,


- Direct method


- Assumed-mean method


- Step Deviation method


We shall calculate the mean using direct method.



So, we have


∑fixi = 748


∑fi = 64


From direct method, mean is given by



Using the above values,



Mean = 11.69


Thus, mean is 11.69.


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