# Probabilities

• Nov 30th 2009, 07:16 PM
Johnboe
Probabilities
1. The problem statement, all variables and given/known data

The marketing department of a magazine collects the following information for a group of randomly selected subscribers. Of households that subscribe to at least one of their three magazines:
25 subscribe to teen world only
19 to star watch only
15 to fashionz only
41 to teen world and star watch
28 to star watch and fashionz
32 to teen world and fashionz
11 to all three magazines
a) Illustrate with a venn diagram

b) Determine the probability that a randomly selected subscriber receives
i) all three magazines
ii) exactly two magazines
ii) at least two magazines
iv) Fashionz
v) star watch or teen world

2. Relevant equations

3. The attempt at a solution

b)

i) N(A)=11
N(S)=138

P(A)=11/138

ii) 21+17+30/138=34/69

iii) 21+17+30+11/138 = 79/139

iv) 15/138
v)
• Nov 30th 2009, 07:33 PM
ANDS!
Tell me how you came up with 138.
• Nov 30th 2009, 08:24 PM
Johnboe
Quote:

Originally Posted by ANDS!
Tell me how you came up with 138.

Well, in my venn diagram.

http://i48.tinypic.com/2k4pdz.jpg