Exercise · ZW-CLASSICAL-PROBABILITY-002 · ★☆☆ Basic
A fair coin is tossed three times. What is the probability of getting exactly two heads?
Choose one option.
Show answer
- A. \(\frac{3}{8}\)
Explanation
There are \(2^3=8\) equally likely sequences and 3 have exactly two heads (HHT, HTH, THH): \(\frac38\).
Review the concept: Classical probability
The classical probability \(P(A)\) of an event \(A\), when the sample space \(\Omega\) is finite with equally likely outcomes, is the ratio of favorable to possible outcomes.
\[P(A)=\frac{|A|}{|\Omega|}\]
More practice problems: classical probability
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