College Math CLEP Prep Practice Exam

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If the probability of an event occurring is 0.25, what is the probability it will not occur?

0
0.25
0.75
1

The correct answer is: 0.75

The probability of an event occurring can also be thought of as the likelihood of that event happening. If the probability of an event occurring is 0.25, that means there is a 25% chance of that event happening. In other words, if you were to repeat the event many times, you would expect it to occur 25% of the time. Therefore, the probability of the event not occurring is 1 - 0.25, which equals 0.75 or 75%. This means that there is a 75% chance of the event not happening. Option A is incorrect because the probability of an event not occurring cannot be 0, since there is always a chance of the event happening. Option B is incorrect because it is the same probability as the initial event occurring, not the opposite. Option D is incorrect because a probability of 1 means the event will definitely