The first step is to find the total population of the sample, to do it, find the sum of each column and then find the sum of both results:
The total population is 18.
Now, to find the probability that a selected soup was chicken noodle and ordered in a bowl, divide the number of favourable cases, that are 3, by the number of total cases, which is 18:
[tex]P=\frac{3}{18}=\frac{1}{6}[/tex]
The probability is 1/6.
