Probability is the

a. numerical measure of the likelihood that an event will occur.

b. chance that an event will not happen.

c. number of successes divided by the standard deviation of the distribution.

d. number of successes divided by the number of failures.

Answer:. The answer is A. Probability is the numerical measure of the likelihood that an event will occur.

Step-by-step explanation:

Probability is the numerical measure of the likelihood that an event will occur. It is the ratio of the possibility of an event happening to the total number of events.

It is lesser than 100 or 1.

It is usually expressed as a fraction or decimal. The probability of an event not happening is 1 - the probability that the event happening.

This can also be expressed in terms of success or failure.

Thus, the probability of failure = 1 - probability of success