A survey of 80 commuters asked about their primary method of transportation to work and their commute distance. The results are summarized in the table below.
| Commute Distance | Bicycle | Walk | Total |
|---|---|---|---|
| Under 1 mile | 15 | 25 | 40 |
| 1 mile or more | 35 | 5 | 40 |
| Total | 50 | 30 | 80 |
Based on the table, what fraction of the commuters who commute a distance of under 1 mile choose walking as their primary transportation method?
Cevap: 0.625
Cevap
5/8 or 0.625
To find the fraction of commuters who commute a distance of under 1 mile that choose walking, limit the sample space to the row representing 'Under 1 mile', which has a subtotal of 40 commuters. Within this row, 25 commuters walk. Thus, the fraction is 25/40, which simplifies to 5/8 (or 0.625).
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Conditional Probability from a Two-Way Table