Solve the Problem $\frac { 9 } { 100 }$ B $\frac { 3 } { 50 }$

Solve the problem.
-The final exam grades for a sample of students in a physical science class resulted in the following grade distribution. If one student taking physical science is selected at random, find the probability of the following events.
a. The student earned an "A".
b. The student earned an "F".

A) a. $\frac { 9 } { 100 }$
b. $\frac { 3 } { 50 }$
B) a. $\frac { 46 } { 55 }$
b. $\frac { 49 } { 55 }$
C) a. $\frac { 9 } { 55 }$
b. $\frac { 6 } { 55 }$
D) a. $\frac { 3 } { 11 }$
b. $\frac { 6 } { 55 }$