Final answer:
The epmo metric for the exam grading process is 7.41.
Step-by-step explanation:
The epmo metric measures the number of exams graded incorrectly per thousand exams.
To calculate the epmo metric for the exam grading process, we need to know the total number of exams and the number of exams graded incorrectly.
In this case, there are 6 home room classes, each with 30 students, resulting in a total of 6 * 30 * 3 = 540 exams. We are given that 4 exams were graded incorrectly.
Therefore, the epmo metric is (4 / 540) * 1000 = 7.41.