A normal distribution has a mean of u=60 and a standard deviation of σ=12. For each of the following samples, compute the z-scoe 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.  a. M=64 for n=4 scores b. M=64 for n=9 scores  c. M=64 for n=16 scores  d. M=64 for n=36 scores

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