Question 858259
Getting probability(P) we use the formula:
{{{P=no.of-favorable-outcomes/no.of-possible-outcomes}}}

So the no. of possible outcomes is 18 since there are 18 boy pupils, and the favorable is 8 since only 8 passed.

So, 

{{{P=8/18}}}
{{{P=4/9}}}

or {{{44.44%}}}


Hope that helps!

:)