One student is selected at random from group of 12 freshmen, 16 sophomores, 20 juniors, and 2 seniors. find the probability that the person selected is

12 Freshmen
16 Sophomores
20 Juniors
2 Seniors

This adds up to 50 total students.
12 / 50 = 0.24; 24% Chance the student is a Freshmen
16 / 50 = 0.32; 32% Chance the student is a Sophomore
20 / 50 = 0.40; 40% Chance the student is a Junior
2 / 50 = 0.04; 4% Chance the student is a Senior

12 / 50 = 0.24; 24% Chance the student is a Freshmen
16 / 50 = 0.32; 32% Chance the student is a Sophomore
20 / 50 = 0.40; 40% Chance the student is a Junior
2 / 50 = 0.04; 4% Chance the student is a Senior
easy  kinda