Question

a v. math of finance sem a- a
omobile ownership
seat-belt usage across different road types
what is the joint frequency of drivers not using seat belts on rural roads?
road type yes no total
highway 70 30 100
city 50 50 100
rural 60 40 100
total 180 120 300
40
30%
30
40%

Explanation:

Step1: Identify the relevant cell

We look at the table for the row corresponding to "Rural" road type and the column corresponding to "No" (not using seat belts).

Step2: Read the value

The value in that cell (Rural - No) is 40. So the joint frequency of drivers not using seat belts on rural roads is 40.

Answer:

40