Question

what is the probability of an event that is certain?

Explanation:

Step1: Recall probability definition

Probability of an event \( E \) is \( P(E)=\frac{\text{Number of favorable outcomes}}{\text{Total number of possible outcomes}} \).

Step2: Analyze certain event

A certain event has all possible outcomes as favorable. So if total outcomes = \( n \), favorable = \( n \). Then \( P(\text{certain event})=\frac{n}{n}=1 \).

Answer:

1