Astatistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 45.0 and 55.0 minutes. find the probability that a given class period runs between 50.75 and 51.75 minutes.

In this problem, we are given a 10-minute range, from 45 to 55 minutes. The question is asking for a 1-minute range, 50.75 to 51.75 minutes. A 1-minute range out of a total 10-minute range gives us 1/10 chance, or 10% probability.