Please help!!
Provide an appropriate response and show your work.
The SAT is an exam used by colleges and universities to evaluate undergraduate applicants. The test scores are normally distributed. In a recent year, the mean test score was 1477 and the standard deviation was 297. The test scores of four students selected at random are 1930, 1340, 2150, and 1450.
a) Find the z-scores that correspond to each value
b) Determine whether any of the values are unusual.