Question

In a survey of 300 members of a local sports club, 150 members indicated that they plan to attend the next Summer Olympic Games, 90 indicated that they plan to attend the next Winter Olympic Games, and 60 indicated that they plan to attend both games. How many members of the club plan to attend

Answer 1

(a) At least one of the two games?
(b) Exactly one of the games?
(c) The Summer Olympic Games only?
(d) None of the games?

Answer 2

a) - 300
b) - 240
c) - 150
d) - 0

Answer 3

Wait, are you calculating the probability or the no. of members? Doesn't sound right...

Answer 4

I made an assumption that if a person indicated that they are attending both games, they are not considered a part of the summer/winter attendees number. In other words, 150 is exclusively summer and 90 is exclusively winter.

Answer 5

90 goes "only" to summer games, 30 goes "only" to winter games, and 60 to both games.

Answer 6

That makes sense Nicolas. I figured the survey looked liked this:

o - summer olympics
o - winter olympics
o - both

As in you could only choose one of the above three.