2 . Use the normal approximation to the binomial with n=10 and p=0.5 to find the probability P(X27) (4 marks) 3. What is sampling error? (2 marks) 4. The following shows four values of all patients' age under Dr Ali's supervision. 38, 48, 50, 84 a) Compute the population mean of the patients' age. (1 mark) b) Construct a table for a sample means of size two and find all the possible sample means. (3 marks) c) Find the sampling error for sample data of 38 and 84. (1 mark)