MAT 361: Probability and Statistics (s8) North South University
Final Examination, Summer 2021
MAT 361: Probability and Statistics (s8)
Total Marks: 20, Duration: 1 hour
[Answer any FOUR questions; figures in the right margin indicate marks]
1. (a) If there are 3000 machines in a factory and breakdown probability is 0.0001. (i)
What is the probability that after the machine is repaired it lasts at least a week before
failing again? (ii) What is the probability that two machines will run two more days
before breaking down?