Two-Way Tables/Contingency Tables

Calculate the probability of an event from a contingency table.

A school cafeteria wants to find out what combinations of food and beverage students are ordering. The results are represented in the two-way table below:

Food

Pizza Hamburger Salad

Beverage Water 11 7 23

Slurpee 18 19 5

Soda 28 12 14

Of the students who ordered pizza, what is the probability that a student also ordered a soda?

• a.)28/57
• b.)28/137
• c.)54/137
• d.)28/54