1. Example (Probability Mass Function (PMF))

A box contains 7 balls numbered 1,2,3,4,5,6,7. Three balls are drawn at

random and without replacement. . Let X be the number of 2's drawn in the experiment.

Write down the probability mass function (PMF) for X: (Use your counting techniques)

2. Example (Probability Mass Function (PMF))

Toss a coin 3 times.

Let X be the number of heads tossed. Write down the probability mass function (PMF) for X: {Use a table...}

Show the PMF graphically: