3. The distances traveled by individuals to work is exponential,with a mean of 9 miles.
(a) What is the probability that they travel between 5 and 11miles? (2)
(b) What is the 80th percentile of this distribution?(2)
4. The annual number of crimes in a city has a normaldistribution, with mean 200, and standard deviation 42.
(a) What is the probability of less than 150 crimes next year?(2)
(b) What is the 75th percentile of this distribution?(2)
