Stem-and-Leaf Graphs (Stemplots), Line Graphs, and Bar Graphs: example 2.7

Table 2.13 is a two-way table showing the types of pets owned by men and women.

	Dogs	Cats	Fish	Total
Men	4	2	2	8
Women	4	6	2	12
Total	8	8	4	20

Table 2.13

Given these data, calculate the marginal distributions of pets for the people surveyed.

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Solution
$Dogs = 8/20 = 0.4$
$Cats = 8/20 = 0.4$
$Fish = 4/20 = 0.2$
Note—The sum of all the marginal distributions must equal one. In this case, $0.4 + 0.4 + 0.2 = 1;$ therefore, the solution checks.

How did it go?

Dogs

Cats

Fish

Total

Men

Women

Total