Final answer:
To find the proportion of seniors whose GPA is between 3.9 and 4.3, we need to calculate the probability. The probability that a randomly chosen senior will have a GPA greater than 4.3 can be found by subtracting the probability of having a GPA between 3.9 and 4.3 from 1.
Step-by-step explanation:
To find the proportion of seniors whose GPA is between 3.9 and 4.3, we need to calculate the probability. Probabilities are calculated using the formula:
Probability = (Number of favorable outcomes) / (Total number of outcomes)
In this case, the favorable outcomes are the seniors whose GPA is between 3.9 and 4.3, and the total number of outcomes is the total number of seniors. If we have this information, we can calculate the probability. The probability that a randomly chosen senior will have a GPA greater than 4.3 can be found by subtracting the probability of having a GPA between 3.9 and 4.3 from 1 (since the sum of all probabilities is equal to 1).