19. A public opinion polling agency surveyed 200 government employees. The following table shows the ages of the employees interviewed: Age Number of employees 21-25 20 26-30 30 31-35 40 36-40 50 41-45 30 46-50 20 51-55 10 i) Calculate the mean age of the employees interviewed. (2) ii) Compute the mean deviation of the ages about the mean age. (3)
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