In each situation below, calculate the standardized score (or z-score) for the value x:
a. Mean μ = 65, standard deviation σ = 4, value x = 70.
b. Mean μ = 120, standard deviation σ = 10, value x = 115.
c. Mean μ = 72, standard deviation σ = 8, value x = 82.
d. Mean μ = 72, standard deviation σ = 8, value x = 62.