Friday
October 31, 2014

Homework Help: math - classifying events

Posted by CL on Thursday, May 6, 2010 at 7:58pm.

A market survey has estimate that the probability of a household's subscribing to the following magazines is:

Reader's Digest - 0.6
Chatelaine - 0.5
Maclean's - 0.4
Reader's Digest and Chatelaine - 0.2
Reader's Digest and Maclean's - 0.2
Chatelaine and Maclean's - 0.15
All three - 0.05

a) What is the probability that a household chosen at random subscribes to only Reader's Digest?
b) What is the probability that a household chosen at random subscribes to Chatelaine, Maclean's, or both?
c) What is the probability that a household chosen at random subscribes to one magazine only?

Today, I learnt 3 new formulas..

P(A and B) = P(A) * P(B)
P(A or B) = P(A) + P(B)
P(A or B) = P(A) + P(B) - P(A and B)

and I'm not sure which one to apply to which question. =S

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