20. Which of the following probabilities describes an event that is very likely, but not certain, to occur?
Answer: B
97 percent probability describes an event that is very likely, but not certain, to occur.
A probability of 97 percent indicates that there is a very high chance of an event occurring, while still allowing for a small possibility that it may not happen.
A) 100 percent
A probability of 100 percent signifies certainty that an event will occur. Therefore, it does not fit the description of being "very likely, but not certain" since it guarantees the event's occurrence.
B) 97 percent
A probability of 97 percent indicates that there is a high likelihood of the event occurring, but it still acknowledges a 3 percent chance that it may not happen. This aligns perfectly with the description of being very likely, but not certain.
C) 50 percent
A probability of 50 percent indicates an equal chance of the event occurring or not occurring. This does not reflect a strong likelihood and thus does not meet the criteria of being "very likely."
D) 5 percent
A probability of 5 percent suggests that the event is unlikely to happen, making it far from being considered "very likely." This option clearly does not match the requirement of a high likelihood of occurrence.
Conclusion
The correct answer, 97 percent, effectively captures the essence of an event that is very likely to occur while still leaving room for uncertainty. All other options either represent certainty, equal chances, or a low likelihood, thus failing to meet the criteria of the question.