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受欢迎的 Word Problems >

A coin is tossed five times. Find the probability of getting exactly three heads.

解答

A co in i s t osse d f i v e t im es . F in d t h e p ro babi l i t y o f g e tt in g e x a c tl y t h ree h e a d s .

解答

\frac{5}{16}

+1

十进制

0.3125

求解步骤

The possible outcomes when a coin is thrown

5

times are

2 \cdot 2 \cdot 2 \cdot 2 \cdot 2

Therefore, the number of possible outcomes:

2^{5}

Find the number of favorable outcomes of getting exactly 3 heads:

10

Probability

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

= \frac{10}{2 ^{5}}

\frac{10}{2 ^{5}} = \frac{5}{16}

= \frac{5}{16}

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