Today is also Live Long and Prosper Day, in honor of Leonard Nimoy, the actor who played Dr. Spock on the original Star Trek. According to the TNG Technical Manual, it would have taken an average time of ten years to build a spaceship like the Enterprise. Assume that the build time follows a normal distribution, with a standard deviation of 1.5 years. What is the probability that a spaceship is built in less than 8 years? What is the probability that a spaceship takes between 7.5 and 9.5 years to build