You are given: (i) Low-hazard risks have an exponential claim size distribution with mean 0. (ii) Medium-hazard risks have an exponential claim size distribution with mean 20 . (iii) High-hazard risks have an exponential claim size distribution with mean 30. (iv) No claims from low-hazard risks are observed. (v) Three claims from medium-hazard risks are observed, of sizes 1, 2 and 3. (vi) One claim from a high-hazard risk is observed, of size 15. Determine the maximum likelihood estimate of 0. (A) 1 (В) 2 (C) (D) 4 (E) 3.

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