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 = 40 and σ = 2
c) µ = 55 and σ = 2
d) µ = 60 and σ = 20