An examination consists of 40 multiple-choice questions, with each question having four options. Suppose you randomly select the answer to each question - that is, you guess. What is the probability of obtaining at least 50% in the examination?
From past data Safe-As-Houses concludes that the age of houses in the suburb of NewAcres is uniformly distributed between 20 and 40 years.
What is the probability that the age of a randomly chosen house in NewAcres is:
a. more than 30 years?
b. between 25 and 35 years?
c. less than 35 years?