Answer
3 Heads → $\frac{1}{8}$
2 Heads and 1 Tail → $\frac{3}{8}$
2 Tails and 1 Head → $\frac{3}{8}$
3 Tails → $\frac{1}{8}$
Work Step by Step
The possible outcomes are:
HHH, HHT, HTH, THH, HTT, THT, TTH, TTT
Therefore the probability model can be
3 Heads → $\frac{1}{8}$
2 Heads and 1 Tail → $\frac{3}{8}$
2 Tails and 1 Head → $\frac{3}{8}$
3 Tails → $\frac{1}{8}$
