Chapter 6, Question 6.10: A set of final exam grades in an intro stats course is normally distributed with a mean of 73 and a standard deviation of 8. a. What is the probability that a student scored below 91 on this exam? b. What is the probability that a student scored between 65 and 89? C. The probability is five percent that a student taking the test scores higher than what grade? Chapter 6, Question 6.6: Given a normal distribution with =50 and o=4, what is the probability that a. X>43 b. Xc42 c. Five percent of the values are less than what X value? Chapter 6, Question 6.24: The time between arrivals of customers at a bank during the noon-to-1PM hour has a uniform distribution between 0 to 120 seconds (X~U[0,120]). What is the probability that the time between the arrival of two customers will be a. Less than 20 seconds b. Between 10 and 30 seconds c. More than 35 seconds d. What are the mean and standard deviation of the time between arrivals