Answer
$21\%$
Work Step by Step
By the definition of conditional probability: $P(B|A)=\frac{P(A\cap B)}{P(A)}$.
Hence here: $P(\text{fever and sore throat})=P(\text{fever})\cdot P(\text{sore throat|fever})=70\%\cdot30\%=0.7\cdot0.3=0.21=21\%$
Stats: Data and Models (3rd Edition)
by De Vaux, Richard D.; Velleman, Paul D.; Bock, David E.
Published by
Pearson
ISBN 10:
0321692551
ISBN 13:
978-0-32169-255-9
Chapter 15 - Probability Rules! - Exercises - Page 377: 13
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