Question

a highschool class has 12 girls, 19 boys. if one is chosen at random what is the probability that person is a girl (please help now)

Answer 1

p(girl) = 12/31

Explanation:

p(event) = (number desired outcomes)/(total number of possible outcomes)

Here, we have 12 girls and 19 boys. The total is 12 + 19 = 31. When we pick one out of all of them, we are picking one out of 31, so the total number of possible outcomes is 31, every single one of the girls and boys.

The desired outcome is picking one girl. How many ways can you pick a girl? The answer is 12 since there are 12 different girls. The number of desired outcomes is 12.

p(girl) = (number of desired outcomes)/(total number of possible outcomes)

p(girl) = 12/31