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The following data gives the informatio...

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

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