1. Think about a density curve that consists of two line segments. The first goes from the point (0, 1) to the point (0.4, 1). The second goes from (0.4, 1) to (0.8, 2) in the xy-plane. What percent of observations fall below 0.40?

2. If X is normally distributed with a mean of 30 and a standard deviation of 2, find P(30 X 33.4).

3. The length of time needed to complete a certain test is normally distributed with mean 83 minutes and standard deviation 10 minutes. Find the probability that it will take less than 95 minutes to complete the test.