Question

A college professor teaching a class of Psychology gives the following grades during Fall semester: 15% A’s, 20% B’s, 40% C’s, and 10% D’s. The remainder of the students receive an F.

What is the probability that a randomly selected student does not earn an A in this class?

Answer 1

The probability that a randomly selected student does not earn an A in the class is 85%, which is calculated by subtracting the percentage of A's (15%) from 100%.

Step-by-step explanation:

The question of what is the probability that a randomly selected student does not earn an A in a class can be answered using the complement rule of probability. Since 15% of the students received A's, we can subtract this percentage from 100% to find the probability of a student not earning an A. Therefore, the probability is 100% - 15% = 85%.

Answer 2

85%

Step-by-step explanation:

Because we can see that only 15% of the class obtained A's, and the question only refers to those that did not receive A's, we can subtract the 15% of the 100% whole to get 85%. This can also be written as 85/100 or 17/20(simplified).