(4 marks) Exam scores of an easy exam (with y = 88, s = 10, minimum = 65, Q1 = 77, median = 85, Q3 = 91 and maximum = 100).

Address the following questions:

a Compute the z-score for the minumum and maximum exam scores. Are these values unusual? (Note: it is unusual to observe an observation that is more than 3 standard deviations from the mean in absolve value).

b What are the most appropriate measure of centre and spread for the distributions of job security based on the data?