a fair coin is flipped 10 times. What is the probability that exactly 4 of the 10 flips come up heads?

解

a f ai r co in i s f l i pp e d 10 t im es . Wha t i s t h e p ro babi l i t y t ha t e x a c tl y 4 o f t h e 10 f l i p s co m e u p h e a d s ?

\frac{1}{2}

十進法表記

0.5

解答ステップ

The possible outcomes when \mathrm{a coin is thrown} is

{H, T} .

Therefore, the number of possible outcomes:

2

The number of favorable outcomes of \mathrm{exactly 4 of the 10 flips come up heads}:

1

Probability

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

= \frac{1}{2}