AP BIOLOGY

Detailed explanation-1: -Both times the probability is 1/2 * 1/2 = 1/4. The probability of getting 1 tail is 2 * (1/2 * 1/2), as it can happen either way round, so 1/2. So the total probability of getting tails is 3/4.

Detailed explanation-2: -Probability of obtaining two heads and two tails =616=38. Hence, the chance that there should be two heads and two tails after tossing four coins is 38.

Detailed explanation-3: -When a coin is tossed twice, the coin has no memory of whether it came up heads or tails the first time, so the second toss of the coin is independent. The probability of heads on the first toss is 50%, just as it is on all subsequent tosses of the coin. The two outcomes of the toss of a coin are heads or tails.

Detailed explanation-4: -for each coin is 1/2 or 50%. For two coins, there are four possi-ble outcomes (i.e., heads/heads, tails/tails, heads/tails, tails/heads). The theoretical probability of each outcome is ¼ = . 25.