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The following data gives the information...

The following data gives the information on the observed lifetimes (in hours) of 225 electrical components :
`{:("Lifeline (in hours)","Frequency"),(0-20,10),(20-40,35),(40-60,52),(60-80,61),(80-100,38),(100-120,29):}`
Determine the modal lifetiemes of components :

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The correct Answer is:
65.625 hours
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