Question

there are 13 girls and 15 boys in a  line. if one student is chosen at a random then find the probablity that he is a boy ? 

Answer 1

Hi ,

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The theoretical ( classical ) probability of an event  E , written as P(E),

its define as 

P(E) = ( Number of outcomes favorable to E) / ( Number of all possible

                                                           outcomes of the experiment )

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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

I hope this helps you.

*****

 

Answer 2

15/28.......................................