An unbiased coin is tossed 15 times.
1. Find the probability that the coin lands heads exactly 9 times. a. 0.0003 b. 0.3571 c. 0.6429 d. 0.1527 e. 0.4213
2. Find the probability that the coin lands tails at most 3 times. a. 0.0002 b. 0.0037 c. 0.5000 d. 0.0176 e. 0.8723
3. Find the probability that the coin lands heads at least 3 times. a. 0.0005 b. 0.9963 c. 0.9333 d. 0.0003 e. 0.8890