7. There is an 40% chance of rain on Saturday and a 25% chance of rain on Sunday. Find
the following:
(a) There is rain at some point over the weekend.
(b) There is no rain on the weekend.
(c) It rains on Saturday.
(d) It rains on Sunday but not on Saturday.
8. Pedro observed what customers ordered at his ice cream shop and found the following
probabilities: $p(vanilla) = 0.3$, $p(sundae) = 0.2$, and $p(vanilla \text{ } sundae) = 0.15$. Find
the probability that a customer ordered vanilla ice cream given they ordered a sundae.