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in a classroom the probabilty that the teacher chooses a boy from a girl is 0.45. how many boys are there?
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5 votes
in a classroom the probabilty that the teacher chooses a boy from a girl is 0.45. how many boys are there?

User M Rajoy
by
6.5k points

2 Answers

4 votes
P=favorable outcome/total outcome
P of choosing boy is given which 0.45
0.45=B/20
B=9 boys
User Icel
by
5.7k points
2 votes
0.45/1 becuase 1 is 100%
0.45/1=4.5/10=45/100=9/20

9/20 chance that chooses a boy
20 people
9/20 times 20=9
9 boys
User Kabeer Arora
by
6.0k points
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