need this done fast thanks

3. (Show yourWorkl) To the right, is a random sample of our classes last Exam scores. 57 87 102 a. Suppose the population mean mu, for the normally distributed variable, is 85.54 Find the z-score for a student who scores a 53 to determine if the student is 62 83 87 considered an outlier. If determined to be an outlier, denote which type. b. What proportion of the population being considered scored lower than an 80% on the exam? (round to four decimal places). c. When applying inferential statistics, the sample doesn't necessarily need to be representative. but it needs to be 84