Question: Those with young children understand that Trick-or-Treating is a SCIENCE. It requires strategy, endurance, charisma, speed, and occasionally treachery. Many years of candy data collection have resulted in the following base of knowledge. On average, a goblin will visit 68 homes with a standard deviation of 10. Knowing this, find the following:

a. The probability that any given goblin will visit at least 50 homes.

b. The percentage of expert goblins that manage to visit more than 80 homes.

c. The percentage of goblins that visit at least 60 but less than 70 homes.