What is the probability that we get the head at least two times when we toss a coin three times?

解

Wha t i s t h e p ro babi l i t y t ha t w e g e t t h e h e a d a t l e a s t tw o t im es w h e n w e t oss a co in t h ree t im es ?

\frac{1}{2}

十進法表記

0.5

解答ステップ

The possible outcomes when a coin is thrown three times are

2 \cdot 2 \cdot 2

Therefore, the number of possible outcomes:

2^{3}

Find the number of favorable outcomes of we get the head at least 2 times:

4

Probability

= \frac{number of favorable outcomes}{total number of outcomes}

= \frac{4}{2 ^{3}}

\frac{4}{2 ^{3}} = \frac{1}{2}

= \frac{1}{2}