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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.

Solution

Solution

\frac{1}{4}

Solution steps

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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