You receive your midterm exam scores for four classes. In all four classes, your midterm score was X = 70. Below is the mean and standard deviation for each of your classes. Compute the z-score for each midterm exam score and summarize in words how you performed relative to other students in the class.

a. Class 1: μ = 70 and σ = 10

b. Class 2: μ = 50 and σ = 20

c. Class 3: μ = 80 and σ = 5

d. Class 4: μ = 80 and σ = 20