I need help with this these two problem PLEASE!!!

Question

For a population with a mean of μ � 80 and a standard
deviation of � � 12, find the z-score corresponding to
each of the following samples.
a. M � 83 for a sample of n � 4 scores
b. M � 83 for a sample of n � 16 scores
c. M � 83 for a sample of n � 36 scores

A population forms a normal distribution with a mean
of μ � 80 and a standard deviation of � � 15. 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.
a. M � 84 for n � 9 scores
b. M � 84 for n � 100 scores

Answer 1

Z = (score-mean)/SEm

SEm = SD/√n