4. On the same assumption, find the probability that the mean of a random sample of 5 such motorcycles will be less than 8 years. A. 0.1915 C. 0.4772 D. 0.4875 B. 0.3413 5. On the same assumption, find the probability that the mean of a random sample of 9 such motorcycles will be less than 11 years. A. 0.2257 C. 0.4192 B. 0.3413 D. 0.4332

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