David set a mathematics quiz for his students. The quiz is marked out of 10. His students' marks are summarized in the table below: Marks Number of students 2 5 3 6 4 4 5 1 6 15 7 20 8 10 9 3 (a) Construct an appropriate frequency table and draw a histogram to depict the data above (10 marks) (b) Compute the mean (10 marks) (c) Calculate the variance and standard deviation (10 marks) (d) Calculate the coefficient of variation (5 marks) (e) Interpret the distribution of marks as shown in your histogram