If a fair coin is tossed 3 times, what is the probability, to the nearest thousandth, of getting exactly 1 tails?

解

I f a f ai r co in i s t osse d 3 t im es, w ha t i s t h e p ro babi l i t y, t o t h e n e a res t t h o u s an d t h, o f g e tt in g e x a c tl y 1 t ai l s ?

\frac{3}{8}

十進法表記

0.375

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 to the nearest thousandth of getting exactly 1 tails:

3

Probability

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

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

2^{3} = 8

= \frac{3}{8}