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The following table shows the frequency distribution of undergraduate students attending Arizona State University (ASU) in the Fall 2012 semester by class level.

1 indicates a freshman, 2 indicates a sophomore, 3 indicates a junior, and 4 indicates a senior.

We can observe from the given table that for a random variable X the possible values are 1, 2, 3, and 4.

Here the value of x becomes 3.

The notation is $\left\{X=3\right\}$.It represents the event that the selected student is from a junior class of level 3.

Here 3 represents the junior which includes 17,302 students.

To make a probability histogram, use MINITAB.

Procedure for MINITAB:

Step 1: Select Graph>Bar Chart from the drop-down menu.

Step 2: Select Values from a table from the Bars indicate section.

Step 3: Select Simple under One column of values. Click OK

Step 4: In Graph variables, type P (X = x) in the column.

Step 5: Fill in the X column in the Categorical variable.

Step 6: Click the OK button.

Step 7: Go to the Scale tab and select the horizontal axis.

Step 8: Type 0 in the Gap between clusters field.

Step 9: Click the OK button.