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      Question

      In 2005, insomnia was the most common sleep disorder in

      the UK, followed by sleep apnea and narcolepsy, in that order. The incidence rates for both sleep apnea and narcolepsy increase with weight, but the incidence rate for insomnia is the same for people of all weight categories. The average weight of the UK population has increased between 2005 and 2015. Which of the following conclusions can be most properly drawn about sleep disorders in the UK from the information given above?
      A A majority of the population was affected by at least one of the sleep disorders mentioned above by the year 2015. Correct Answer Incorrect Answer
      B Sleep apnea became the most common sleep disorder in 2015. Correct Answer Incorrect Answer
      C Insomnia was more common than either sleep apnea or narcolepsy in 2015. Correct Answer Incorrect Answer
      D Fewer people suffered from insomnia in 2015 than had suffered from it in 2005. Correct Answer Incorrect Answer
      E The average weight of people suffering from insomnia has increased between 2005 and 2015. Correct Answer Incorrect Answer

      Solution

      As per the argument, though there are higher incidences of sleep apnea and narcolepsy in people who are heavier, the rate of incidences of insomnia is same across all weight sections. Thus, if the average weight of the population of the UK increased in the period from 2005 to 2015, then, it means the average weight of those suffering from insomnia also increased. The same conclusion is given in option (e). Thus, option (e) is the right answer.

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