Suppose you are turned into an ant and (once you're done panicking) start walking from the top of this tree to the bottom. You aren't sure which way to go, so you bring a tiny ant-sized coin with you, and flip it before leaving each box. If it comes up heads, you crawl along the arrow labeled "H", and if it comes up tails, you crawl along the arrow labeled "T". In each box, fill in the probability that you'll end up crawling through it. There is one spot to enter it as a fraction, and another (after the "≈" symbol) to enter it as a decimal; fill in both. We've done the first one for you, because it's obviously the hardest.
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