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人気のある Word Problems >

Use the classical definition to find the probability of the following event: Flipping a fair coin twice and getting 2 heads. Express your answer as a decimal rounded to 1 decimal place.

解

U se t h e c l a ss i c a l d e f ini t i o n t o f in d t h e p ro babi l i t y o f t h e f o ll o w in g e v e n t : Fl i pp in g a f ai r co in tw i ce an d g e tt in g 2 h e a d s . E x p ress yo u r an s w er a s a d ec ima l ro u n d e d t o 1 d ec ima l pl a ce .

解

\frac{1}{4}

+1

十進法表記

0.25

解答ステップ

The possible outcomes when a coin is thrown two times are

2 \cdot 2

Therefore, the number of possible outcomes:

2^{2}

Find the number of favorable outcomes of getting 2 heads:

1

Probability

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

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

2^{2} = 4

= \frac{1}{4}

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