INTRODUCTION TO STATISTICS (PAM2100001LEWISFALL2009)
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Suppose that A and B are two events with P(A) = 0.4, P(B) = 0.3,
and P(BA)=0.2. What is P(A or B)? (Remember to express your
answer as a proportion.)
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Call a household prosperous if its income exceeds $150,000. Call
the household educated if the householder completed
college. Select an American household at random, and let
A
be
the event that the selected household is prosperous and
B
the
event that it is educated. According to a government survey, P(
A
)
= 0.25 and P(
B
) = 0.42, and the probability that a household is
both prosperous and educated is P(
A
and
B
) = 0.21. What is the
P(
A
c
and
B
c
)? (Remember to express your answer as a
proportion.)
Question
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 Spring '08
 ABDUS,S.
 Conditional Probability, Democracy, Question Completion Status, disease X.

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