Lashonda is in her first semester at a university and is taking a calculus course with a large enrollment. She just took the rst midterm exam and is nervous about her score, which was 57. Among all the students in the course, the mean of the exam was 83 with a standard deviation of 9. Find the z-score of Lashonda's exam score relative to the exam scores among all the students in the course. Round your answer to two decimal places. z=n