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1. The following salaries (in pesos) were obtained from a sample of 12 executive secretaries:

7,500 13,000 10,300 10,600 7,600 8,350
8,400 5,800 6,300 9,200 7,500 9,470

(a) Find estimates for the mean and variance of the salaries of all executive secretaries.
(b) What is the proportion of executive secretaries with salaries above P9,000.


Sagot :