Answer
81.5%
Work Step by Step
A bell shaped distribution is symmetric. That is, 50% of kidney pairs weigh more than 325 grams and 50% of kidney pairs weigh less than 325 grams.
$325-295=30=1σ$
So, if 68% of kidney pairs weigh between $μ-1σ=295$ grams and $μ+1σ=355$ grams, we can conclude that, $\frac{68}{2}$% $=34$% of kidney pairs weigh between $μ-1σ=295$ grams and $μ=325$ grams.
$385-325=2σ$
So, if 95% of kidney pairs weigh between $μ-2σ=265$ grams and $μ+2σ=385$ grams, we can conclude that, $\frac{95}{2}$% $=47.5$% of kidney pairs weigh between $μ=325$ grams and $μ+2σ=385$ grams.
Now, between 295 grams and 385 grams: $34+47.5=81.5$%
