Lesson 5

Problem. A coin was flipped six times. Find the probability that three heads occurred.

In this and many subsequent problems, you may enter your answer both as a decimal number and as a fraction. Hence, you may enter, say, the number \(0.5\) as \(\texttt{0.5}\) and \(\texttt{1/2}\) (and even as \(\texttt{2/4}\)). If, however, a decimal representation of the answer is infinite, then in most cases we expect a fraction from you. Thus, \(\frac{1}{6}\) may not be entered as \(\texttt{0.166666}\).