You have obtained the following figures for Country X: Gross National Income at market prices Taxes paid by firms Personal taxes Subsidies received by firms Benefits 2060 230 365 60 210 Undistributed profit Depreciation 190 245 Calculate households' disposable income. [2] The following statements have been made concerning the standardised mortality ratio: I It is an example of indirect standardisation. II It is heavily biased towards the relative mortality at the older ages. III It requires knowledge of the age-sex specific mortality rates for the population under consideration. Explain for each of these statements whether it is correct or not. [3]