The annual salaries (in ‘000 US dollars) of a random sample of workers in a company are presented in the following table. Use the data to answer the questions that follow. Annual Salary (‘000 US$) Number of workers10 215 620 1025 1030 535 2(a) Find the following measures of central tendency:(i) Mean(ii) Median(iii) Mode(b) As far as this dataset is concerned, which of the three measures of central tendency you have computed is the least useful? Explain why. (c) Calculate the standard deviation(d) Construct a 93% confidence interval for the true population mean.

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