Question 3 [19 marks] In a factoryI the time during working hours in which a machine is not operating as a result of breakage or failure is called the *downtime". The following distribution shows a sample of l downtim of a certain machine [rounded to the nearest minute]: mm with reference to the above distribution, calculate [a] the three measures of central location. [9] [bl the 1variance of the downtimes [5] {c} the 33rd percentile of the downtimes [5]