Geometry

Question Analysis
This question involves using a frequency table to calculate the probability of a compound event (an “or” event).
The main focus is on understanding how to find the probability of a compound event by adding the probabilities of individual events and correctly using the frequencies from the table to calculate probabilities.

Key Concept Explanation
For two mutually-exclusive events and , the probability of or , denoted as , is .
Probability of an event is calculated as .

Step-by-Step Solution
First, find the total number of students: