the empirical probability that she receive an A is equal to .075 or 7.5%.
this is because, historically, 7.5% of the students who took mr. doodle's course have gotten an A.
the table below shows the probability of getting any specified grade in mr. doodle's course based on past experience.
the probability is equal to the proportion of the population who got that grade.
100% times the proportion equals the percent.
45/600 = .075 * 100% = 7.5%
45 number of people who got A *****
180 number of people who got B
210 number of people who got C
95 number of people who got D
65 number of people who got F
5 number of people who got I
600 total number of people
0.075 ratio of people who got A *****
0.3 ratio of people who got B
0.35 ratio of people who got C
0.158333333 ratio of people who got D
0.108333333 ratio of people who got F
0.008333333 ratio of people who got I
1 total ratio (should be equal to 1)