Answer
$S = \{A,B,C,D, F\}$
Work Step by Step
The sample space of a random phenomenon is the set of all possible outcomes. In this scenario, we assume that the only possible letter grades that a student can receive are $A, B, C, D,$ and $F$, although other systems exist with valid answers. For any letter grade system, ensure that every possible letter in that system is included in $S$
