A normal distribution has a mean of p = 60 and a standard deviation of o = 12. For each of the following samples, compute the z-score for the sample mean, and determine whether the sample mean is a typical, representative value or an extreme value for a sample of this size. M = 64 for n = 4 scores: Z = , which is value. M = 64 for n = 9 scores: Z = , Which is value. M = 66 for n = 16 scores: Z = , Which is value. M = 66 for n = 36 scores: Z = , which is value