1-suppose the time it takes a nine-year old to eat a donut
is between 0.5 and 4 minutes, inclusive. let x = the time,
in minutes, it takes a nine-year old child to eat a donut.
then x^ u (0.5, 4).

a. the probability that a randomly selected nine-year old
child eats a donut in at least two minutes is ?
b. find the probability that a different nine-year old child eats a donut in more than two minutes given that the child has already been eating the donut for more than 1.5 minutes.