Problem
The grades on a history midterm at Almond are roughly symmetric with \( \mu=85 \) and \( \sigma=2.0 \). Michael scored 86 on the exam. Find the z-score for Michael's exam grade. Round to two decimal places.
Solution
Step 1 ：\( Z = \frac{X - \mu}{\sigma} \)
Step 2 ：\( Z = \frac{86 - 85}{2} \)
Step 3 ：\( Z = 0.50 \)
