Exercise Problem II — task. Mathematics CBSE, Class 10.

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The following data gives the information on the observed lifetimes (in hours) of

$225$ electrical components :

Lifetimes (in hours)	$0-20$	$20-40$	$40-60$	$60-80$	$80-100$	$100-120$
Frequency	$10$	$35$	$52$	$61$	$38$	$29$

Determine the modal lifetimes of the components.

Answer:

Mode

$=$

[Note: Enter the answer upto

$2$ decimals.]

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7. Exercise Problem II