Question: Question 5 (6 Marks) Five identical systems starting to function properly at time 0 are working until all of them fail. The first system fails

Question 5 (6 Marks) Five identical systems starting to function properly at time 0 are working until all of them fail. The first system fails after 20 hours, the second after 30 hours, the third after 10 hours, the fourth after 5 hours and the fth system after 15 hours. What is the MTBF of the system? Question 6 (6 Marks) Calculate the variance and standard deviation of the following numbers: 35 , 47, 54

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