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Updated on : 2022-09-05

Solution

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$t_{mem}=t_{avg}=λ1 $

Let No is initial Amount $80$

Amount remains After time t

$N_{t}=N_{0}e_{−λt}$

$N_{0}N_{t} =e_{−λt}$ ___(I)

$t=t_{avg}=λ1 $

from equation (I)

$N_{0}N_{t} =e_{−λ×λ1}=e_{−1}$

$N_{0}N_{t} =e1 =0.367$

$∴$ fraction of Amount left

$N_{0}N_{t} =0.367$

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