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Popular Word Problems >

If a fair coin is tossed 5 times, what is the probability, to the nearest thousandth, of getting exactly 5 tails?

Solution

I f a f ai r co in i s t osse d 5 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 5 t ai l s ?

Solution

\frac{1}{32}

+1

Decimal

0.03125

Solution steps

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 to the nearest thousandth of getting exactly 5 tails:

1

Probability

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

= \frac{1}{2 ^{5}}

2^{5} = 32

= \frac{1}{32}

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