Bus Stats: Homework. Due next week. Question 1 (Show your workings)
1. In a class of 300 students in foundation economics a sample of 12 students has been. The
marks of these students on their first exam on a scale of 100 points as follow:
67,83, 75, 79, 66, 82, 90, 57, 77, 74, 74, 66
(a) Compute the expected value of the sample grades. [2 marks]
(b) Compute the median of the sample grades. [2 marks]
(c) What is the meaning of the median in the context of this problem? [2 marks]
(d) Compute the 80th percentile. What does it mean in the context of this problem?
[2 marks]
(e) Compute the value of standard deviation of these grades. [2 marks]
(f) Compute the coefficient of variation. [2 marks]
Question 2 (Show your workings)
distribution of monthly unemployment rates for PNG for o​