q1 and 2

SHOW ALL EQUATIONS, CALCULATIONS and UNITS. Plots can be done in Excel. 1. The following numbers represent the final exam grades of a sample of ECOR2050 students in Summer 2021. 67 64 66 27 58 85 85 76 69 97 73 75 77 49 87 89 a) Calculate the mean, standard deviation, and coefficient of variation ofthe data set. b) Compute the 80th percentile of the sample. What does it mean? (4 marks) (4 marks) 2. Are there any outliers in the data set of question 1? What numbers are they? What about extreme outliers? You must show all your manual calculations (IQR, etc.) to answer the question. (12 marks)