Probability

Question

In a class of 13 boys and 19 girls, the boys are assigned numbers 1 to 13 and the girls are assigned number 14 to 32. What is the probability that a boy is selected if the number chosen is a multiple of 4?

Answer 1

What are the numbers in this group that are multiples of 4? In particular, how many multiples of 4 are in this group?

4,8,12,...,32

 

How many out of this group are boys?

 

(# of boys that are multiples of 4) / (# of students who are multiples of 4)

is the probability you're looking for.

 

Can you figure this out now?