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3 years ago

15

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.

1 answer:

lukranit [14]3 years ago

7 0

Answer:

0.4

Step-by-step 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

$P=\dfrac{12}{30}=\dfrac{2}{5}=0.4$

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