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The ratio of boys to girls in a class is 2:3. If there are 18 girls in the class, what is the probability of a boy being in the class, P(boy)? SHOW WORK to verify your choice.

User BOFH
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1 Answer

6 votes

Answer:

0.4

Explanation:

If the ratio of boys to girls in a class is 2:3, then

  • there are 2x boys;
  • there are 3x girls.

If there are 18 girls in the class, then


3x=18\\ \\x=6

Thus, there are


  • 2\cdot 6=12 boys;

  • 3\cdot 6=18 girls;

  • 12+18=30 students in total.

The probability of a boy being in the class is


P=(12)/(30)=(2)/(5)=0.4

User Sameh Serag
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