ACT SAT Prep How to determine the probability of a situation

The video tutorial explains a probability problem where Jude has 12 shirts, 3 of which are black. The task is to find the probability of selecting a non-black shirt. The teacher emphasizes the concept of 'part over whole' in probability, where the total number of shirts is the whole, and the number of non-black shirts is the part. By subtracting the number of black shirts from the total, the teacher calculates the probability of selecting a non-black shirt as 3/4.

Explain the concept of 'part over whole' in the context of probability.

How many shirts does Jude have in total?

If there are 12 shirts and 3 are black, how many shirts are not black?

What is the probability that Jude selects a shirt that is not black?

What fraction represents the probability of selecting a shirt that is not black?