5.) Draw a density curve and use the calculator to determine the probability. Write the calculator function. A professor believes that if a class is allowed to work on an examination as long as desired, the times spent by the students would be approximately normally distributed with mean 70 minutes and standard deviation 5 minutes. What is the probability that a student will take between 60 minutes and 75 minutes to finish an exam? 63-TO ENORM SDIST (14) =0.080757 6.) Draw a density curve and use the calculator to determine the probability. Write the calculator function. Given the information for problem #5, the Professor would like the end the exam when 90% of the students have turned in their exam, how much time should she allocate for the exam? GC-7