miben so with the 68-95-99.7 Rule) on the included normal distribution 1. Suppose exam scores form...
miben so with the 68-95-99.7 Rule) on the included normal distribution 1. Suppose exam scores form an approximately normal distribution that has 500 points and 100 points. Letter grades on the exam were distributed as follows: Ds made up 15% of the exam, Ca 59%, Bs 13.5%, As 2.5%, and the rest Fs. () If 1466 students scored 733 points or more, how many students took the exam? students (b) What are the point cutoffs for each letter grade? <A <B< <C< <DC <F 2. At Tasmania State University, the probability that an entering freshman will graduate in four years is 0.89. Let the random variable A denote the number of freshmen in a class of 2000 that will graduate in four years. (a) Find the mean and standard deviation of the distribution of the random variable A. (b) What are the chances that A will be 1752 or more?