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Question -

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



Answer -


We see that class 60-80 has the maximum frequency 61
It is the modal class
Here l = 60, f= 6, f1 = 52, f2 = 38,h = 20
Modal of life time (inhrs.)

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