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What range must the probability of an event lie in?
ABetween minus one and one inclusive
BBetween zero and one hundred inclusive
CStrictly above zero and below one
DBetween zero and one, both included
Answer & Solution
Correct answer: D. Between zero and one, both included
1. A probability is a share of the sample space, so it can never be negative.
2. It can never exceed the whole sample space either, so it cannot pass one.
3. Both endpoints are allowed: zero marks an event that never happens and one marks an event that always happens.
_Source: OpenStax Introductory Business Statistics (CC BY 4.0), Ch 3 "Probability Topics", section 3.1 Terminology_
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