In this statistics question, class intervals aren't continuous. Do we need to make them continuous for mean? Just tell if it's necessary or not because the class mark remains same in either cases.
(No need to solve the question)
Q). The following  table gives the life time of 200 bulbs. Calculate the mean life time of a bulb by step deviation method:

Dear Student,

Here, the classes are not inclusive, but there is no need to change into inclusive ones as the class marks will remain the same whether we change the classes into inclusive ones or not.


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Yes it is a must to do it
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of course you have to. ...thums up !!
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