Question

There are 13girls and 15 boys in a line.if 1 student is chosen at random.find the probability that he is a boy

Answer 1

No. of girls=13
No. of boys=15
Total number of students=13+15=28

$probability \: of \: something \: to \: happen = \frac{number \: of \: successful \: outcomes}{number \: of \: possible \: outcomes}$
therefore
$probability \: of \: choosing \: a \: boy = \frac{15}{28}$
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Answer 2

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According to the problem ,

Number of girls in the line = 13

Number of boys in the line = 15

Total possible out comes = Number of girls + Number of boys

                                        = 13 + 15 

                                        = 28 -------( 1 )

The number of outcomes favorable for one student is chosen at 

random that probability that he is a boy = 15 ---------( 2 )

P (  boy ) = ( 2 ) / ( 1 ) 

                         = 15 /28

answer by--yashvi :)