A car rental business has 8 electric powered and 12 gasoline powered cars in its fleet. A class of engineering graduate students randomly picks 5 of them for a road trip to a manufacturing plant.

 a) What is the probability that the group ends up selecting:

i. Electric cars only?

ii. More electric cars than gasoline cars?

iii. At least one electric car?

b) Provide the relative frequency interpretation of the probability found in ill) above.