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Mean for an Ungrouped Data

If half-life ...

Question

If half-life period is 100 yr, average life is nearly:

A

100 yr

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B

70 yr

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C

144 yr

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D

90 yr

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Solution

The correct option is B 144 yr
The formula for average lifetime is $t_{a v g}$ = $1.44 t_{1 / 2}$ = $1.44 \times 100 = 144 y e a r s .$

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