In a given week, Paul’s Bike Shop repaired bicycles with the following brand names.

Bicycle Brand                                Number Repaired

Giant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Trek . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Specialized . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Cannondale . . . . . . . . . . . . . . . . . . . . . . . . .  15

Determine the empirical probability that the next bicycle repaired is a

a) Giant.

b) Trek.

c) Cannondale.

Write your answer as a fraction in lowest terms.