Q. 84.5( 19 Votes )

The following data gives the information on the observed lifetimes (in hours) of 225 electrical components:

Determine the modal lifetimes of the components.

Answer :

From the data as given above we may observe that maximum class frequency 61 belonging to the class interval 60 -80

So, modal class = 60-80

l=60, f1=61, f0=52, f2=38, h=20


=60 +


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