What is returned from mystery when it is passed $\{10,30,30,60\}?$ public static double mystery$($int$[]$ arr$)$ l

double output $=0$;

for $($int $i=0$;$i$ arr.length; $i++)$

$\{$

output $=$ output $+$arr$[i]$;

$\}$

return output $/$ arr.length;

$\}$

A$.,17\mathrm{.}5$

B$.,30\mathrm{.}0$

C$.,130$

D$.32$

E$.,32\mathrm{.}5$