QUESTION 5 a) The following table shows that 100 patients infected with COVlD-19 for stages 1 to 4 on a particular day were reported at Hospital XYZ. X 1 2 3 4 Frequency 1 D 20 n 40 i) Find the value of n. (2 man-:5) ii} Calculate the probability that the number of patients infected with COVlD-'IQ is at most stage 2. (2 marks) iii) Calculate the standard deviation of X. (6 marks)