Statistics

II. Problem Solving 1. A calculus instructor uses computer aided instruction and allows students to take the midterm exam as many times as needed until a passing grade is obtained. Following is a record of the number of students in a class of 50 who took the test each number of times. Students Number of Tests 22 15 AWN U a. Find the expected value of the number of tests taken. (10 points) b. Compute the variance and the standard deviation of the number of tests taken. (10 points)