USE R STUDo--- In a population, 30% of people spend 4+ hours daily on smartphone; 25% of people have trouble asleep; and 20% of people spend 4+ hours daily on smartphone and have trouble asleep. Qs: a) If a randomly selected person who spent 4+ hours daily on smartphone, what is the probability this person having trouble asleep? b) If a randomly selected person who spend less than 4 hours daily on smartphone, what is the probability this person having trouble asleep? C) what is the relative risk of having trouble asleep for person spend 4+ daily on smartphone compared to those spend less 4 hours