Question 858260
There is a possible outcomes of 42 since there are 42 pupils.

And there are only 24 boys and only 16 wear glasses, therefore 8 of the boys does not wear glasses.

The probability that the pupil is a boy who does not wear glasses is;

{{{P=8/42}}}
{{{P=4/21}}}
or
19.05%



Hope that helps!

lessthanthree