What is the probability of obtaining at least one head when a coin is flipped four times?

The probability of obtaining 4 tails when a coin is flipped 4 times is:

P(4T) = (1/2)4 = 1/16 = 0.0625

Then, the probability of obtaining at least 1 head when a coin is flipped 4 times is:

P(at least 1 head) = 1 - 1/16 = 15/16 = 0.9375