Maria and Zoe are taking Biology 101 but are in different classes. Maria's class has an average of 78% with a standard deviation of 5% on the midterm while Zoe's class has an average of 83% with a standard deviation of 12%. Assume that scores in both classes follow a normal distribution. Now suppose Maria scored an 84 on the midterm exam and Zoe scored an 89.

Convert Maria's midterm score of 84 to a standard z-score, rounded to the nearest tenth. What is the Z score?