Question

A survey was done that asked people to indicate whether they run or ride a bike for exercise. Based on the table, what is the percentage of runners who do not bike?

Bike Do not bike
Run .727 .103

Do not run .121 .052

Answer 1

Note minor mistake in the data.
All categories are mutually exclusive, so the sum can only have a maximum of 1.00. The given information adds up to 1.003, error will be ignored in the following calculations.

Extract runners from the table : bike: .727, do not bike .103
Therefore
percentage of runners who do not bike
= (0.103)/(0.727+0.103)
= 0.103/0.830
= 0.124 (to three significant digits)
= 12.4%