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Of 755 drivers, 305 use a mobile phone and 280 of those had no speeding violation. What is the probability of no violation and phone use?
AIt is 305/755
BIt is 405/450
CIt is 685/755
DIt is 280/755
Answer & Solution
Correct answer: D. It is 280/755
1. A joint probability reads one cell of the table against the grand total.
2. The cell for phone users with no violation holds 280 drivers.
3. The grand total is 755 drivers, so the probability is 280/755.
_Source: OpenStax Introductory Business Statistics (CC BY 4.0), Ch 3 "Probability Topics", section 3.4 Contingency Tables and Probability Trees_
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