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3. An insurance company classifies its insurance on various bus lines as either low risk or high risk, with the high risk bus lines considered twice as risky. The number of claims per year, Nr for the low risk policies has a Poisson distribution with mean A. The number of claims per year, No for the high risk policies has a Poisson distribution with mean 21. A sample of 5 low risk policies has shown claim counts of 6, 8, 10,9, and 7. A sample of 4 high risk policies has shown claim counts of 17, 16, 19. and 15. Determine the maximum likelihood estimate of A accurate to three significant digits. |8 Marks