Question

An unbiased coin is tossed four times. find the probability of the given event. (enter your answer to five decimal places.) the coin lands heads exactly once.

Answer 1

$\frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} \times \frac{1}{4} = \frac{1}{256}$
$\frac{1}{256} = 0.00391$
Answer is 0.00391

Hope this helps.