For each of the following populations, would a score of X = 50 be considered a central score (near the middle of the distribution) or an extreme score (far out in the tail of the distribution)?

a. µ = 45 and σ = 10

b. µ and σ = 2

c. µ = 90 and σ = 20

d. µ = 60 and σ = 20