No more than 3 heads

Probability Level 2

A fair coin is flipped 10 times. What is the probability that it lands on heads three or fewer times?

Give your answer to three decimal places.

For more Permutations quizzes

The answer is 0.172.

1 solution

Geoff Pilling
May 1, 2016

The probability it will land on heads 3 or fewer times is $\frac{ \binom{10}{0} + \binom{10}{1} + \binom{10}{2} + \binom{10}{3} }{2^{10}} = \boxed{0.172}$

No more than 3 heads

For more Permutations quizzes

The answer is 0.172.

1 solution

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