1) A college professor decides to enter grades in terms of standard deviation. The grades are normally distributed with a mean of 80 and a standard deviation of 6. What is the probability that a...

Extracted text: 1) A college professor decides to enter grades in terms of standard deviation. The grades are normally distributed with a mean of 80 and a standard deviation of 6. What is the probability that a randomly selected student scores a 90 or higher? b. What is the probability that a randomly selected student scores lower than a 70? Use the empirical rule to determine the following: if the professor has 60 students, a. С. approximately how many of those students should have scored between a 74 and 86? (Give the number of students, not just the percentage).