If the age of a sample of seven employees of a fast-food outlet (X) are as follows

19, 19, 65, 20, 21, 18, 20

1) Compute the best central measure.
2) If the oldest employee is retired, compute the best central measures.
3) If the employees in this outlet has a mean of age as with variance between their ages as . Find the mean and the standard deviation of the age of employees of a fast-food in another outlet (Y), if the relation between them is as follows Y = - 0.5 X + 35