4. The following table gives the frequency distribution of the numbers of personal computers sold during...

 

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4. The following table gives the frequency distribution of the numbers of personal computers sold during the past month at sample of 40 computer stores in New York City. Computers Sold Number of Stores 4-12 13-21 22-30 31-39 40-48 6 9 14 7 4 Calculate Final Examination 7 March 2021 14:30 to 17:30 UTC+8 (a) mean; (b) median: (2 marks) (3 marks) (c) mode; (3 marks) (d) variance; (e) standard deviation; (3 marks) (1 mark) (f) Pearson's coefficient of skewness and interpret your finding. (3 marks) 4. The following table gives the frequency distribution of the numbers of personal computers sold during the past month at sample of 40 computer stores in New York City. Computers Sold Number of Stores 4-12 13-21 22-30 31-39 40-48 6 9 14 7 4 Calculate Final Examination 7 March 2021 14:30 to 17:30 UTC+8 (a) mean; (b) median: (2 marks) (3 marks) (c) mode; (3 marks) (d) variance; (e) standard deviation; (3 marks) (1 mark) (f) Pearson's coefficient of skewness and interpret your finding. (3 marks)