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MDM 4U0 Unit 08 Assignment: Continuous Probability Distributions Page 3 of 3 [4] 4 The results on a final exam given by a university professor are normally distributed with a mean of 65.3% and a standard deviation of 8.5. A student with a mark of 70% on the exam justified it to his parents and told them no one got over 80% on the exam. Should his parent's believe him? Explain your answer. Show all required calculations/commands. [4] 5 The masses of a rare breed of adult cats are normally distributed and have a mean mass of 4.2 kg with a standard deviation of 0.5 kg. An article in a pet magazine claims that 1 out of 40 such cats will have a mass of more than 5.2 kg. Is their claim reasonable? Explain/justify your