estion A3 (a) The number of employees of a random sample of companies from City A are listed in the following grouped frequency distribution table: Number of employees Number of companies 2533 12 3442 21 4351 10 5260 16 6169 8 (i) Find the sample mean of the grouped frequency distribution. (3 marks) (ii) Find the sample standard deviation of the grouped frequency distribution. {4 marks) (iii) Find the standard score for a company that has 34 employees and interpret its meaning. Correct your answer to 2 decimal places. {3 marks)