QUESTION 5 a) The following table shows that 100 patients infected with COVID-19 for stages 1 to 4 on a particular day were reported at Hospital XYZ. X Frequency i) Find the value of n. 1 10 2 20 iii) Calculate the standard deviation of X. 3 n 4 40 ii) Calculate the probability that the number of patients infected with COVID-19 is at most stage 2.

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