If a sample is selected from a normal population with = 50 and = 20, which of the following samples is extreme and

If a sample is selected from a normal population with µ = 50 and σ = 20, which of the following samples is extreme and very unlikely to be obtained?

a. M = 45 for a sample of n = 4 scores.

b. M = 45 for a sample of n = 25 scores.

c. M = 45 for a sample of n = 100 scores.

d. The three samples are equally likely to be obtained.