2. A biased coin is tossed 5 times, giving heads with probability $p$. －What is the probability of obtaining heads exactly 2 times? －For which value of $p$ is the probability of obtaining heads exactly 2 times maximum?
2. A biased coin is tossed 5 times, giving heads with probability $p$.\\
－What is the probability of obtaining heads exactly 2 times?\\
－For which value of $p$ is the probability of obtaining heads exactly 2 times maximum?\\