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3) Discuss the concept of outliers with the use of an example. (2 Marks) b) Refer to the information given below for the frequency of a sample of test scores of students in a class. Use this information to calculate the mean and standard deviation. (7 Marks) No of Students Frequency 10 3 1 1 6 12 9 13 1 2 n=30 c) The data shown below shows the number of cars that cross the stop lights in an hour for four days. 20 15 11 Calculate the following using the above data: i) Quartile1 (2.5 Marks) ii) Quartile 3 (2.5 Marks) iii) lnterquartile Range (1 Mark)