how to take height of a unequal distribution for mean

Please find below the solution to the asked query:

When the class intervals are continuous but each of the given classes of unequal width, then we can find the mean with the help of any of the 3 methods : 

1 ) Direct method
2 ) Assumed mean method
3 ) Step deviation method

Consider the following example.

A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent.

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If the data is not in continuous then convert it into continuous form and then find the mean. 
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