The following table shows the marks obtained by applicants for a certain job in an aptitude test. Sorted marks obtained by applicants 73 64 57 49 49 45 41 39 38 38 37 37 37 36 36 34 34 34 34 34 33 31 31 30 30 29 27 27 27 25 (i) Find the mean of the data set [2 Marks] (ii) Find the standard deviation of the data set. [4 Marks] (iii) Find the percentage of values that fall within two standard deviations around the mean.