Question

In a group of 40 students, 23 take the AP Psychology class, 18 take the AP Calculus class, and 8 take both classes. What is the probability that a student takes AP Psychology or AP Calculus?

Answer 1

Im not this sure but i think its 25/40 so its 62.5%

Explanation:

23 Take psychology but 8 takes both so 23-8=15

18-8=10

7 dont take any

this is where im not sure, im not sure if i add the 8 who take both of the classes. I Didnt so its

15+10=25

25/40

Hope this help??

Answer 2

Explanation:

This is a Venn Diagram problem.

23 - 8 = 15 take just AP Psychology

18 - 8 = 10 take just AP Calculus

I think this question is likely done by adding all three areas together to get 33

15 + 10 + 8

33

The probability is therefore 33/40 = 0.825