In a family of 4 children, what is the probability that all four will be girls?

In a family of 4 children, what is the probability that all four will be girls?

P(G) = 1/2 or 0.5

Since each child is independent, we have:
1/2 * 1/2 * 1/2 * 1/2 or (1/2)^4
1/16 or in decimal form, 0.0625