Consider the Spin-&-Win spinner at a funfair in which one pivots freely around, and it is stable while pointing in any direction. There are 20 prizes listed on the spinner numbered from 1 to 20 and include three grand prizes. If a person paid for one of these spins,

a) What distribution would they use to model the spin?

b) What is the probability that a randomly spun prize will be one of the three grand prizes?

c) What is the probability that the spun prize is either from the three grand prizes or the last five prizes?