YOU HAVE ONLY 30 MINUTES !!!!a) Assume that your dataset is a sample from the population, and each number refers to a daily expenditure of a given student. Now, I am interested in the population average i.e. mean expenditure of ADA students. However, the problem is I do not have the full population data. Use first nine observations in your data set and explain what is your estimator and estimate of the population mean? (4%) data : [7 4 3 6 5 5 6 7 6 6 4 6 3 5 5 4 4 6 7 6 0 7 6 8 5 6 6 5 6 5]In all answers show your calculations (Except variance calculation in question 1. But full points will be given to the correct answer). I need well explained answer !!!!