"X is the number of red marbles that Tonya has in her hand after she selects four marbles from a bag containing four red marbles and two green ones and then notes how many there are of each color."

Explained below.

Step-by-step explanation:

There are four red marbles (R) and two green marbles (G) in the bag.

The random variable X is defined as the number of red marbles that Tonya has in her hand after she selects four marbles from the bag.

The probability of selecting a red marble is:

The sample space of X can be defined as follows:

Outcomes: {(RGGG), (RRGG), (RRRG), (RRRR), (RRGR), (RGRR), (GRRR), (RGRG), (GRRG), (RGGR), (GRGR), (GRGG), (GGRG), (GGGR), (GGGG)}

So, the sample space of X is:

S = {0, 1, 2, 3 and 4}

step-by-step explanation: