The weather in Rochester in December is fairly constant. Records indicate that the low temperature for each day of the month tend to have a uniform distribution over the interval $15^{\circ}$ to $35^{\circ}$F. A business man arrives on a randomly selected day in December.

(a) What is the probability that the temperature will be above $19^{\circ}$?
answer:

(b) What is the probability that the temperature will be between $19^{\circ}$ and $26^{\circ}$?
answer:

(c) What is the expected temperature?
answer: