(1] A drug policy researcher wants to identify the degree to which a group of former drug addicts in a population are at risk for becoming addicted to drugs again in the future. Based on various risk factors, the researcher develops a measure of risk {called the Addiction Risk Index, or ARI). High scores of ARI indicate a higher risk of future drug addiction than do low scores. Assume that ARI scores are normally distributed with mean 50 and standard deviation 4. (a) If a former drug addict is selected at random from the population, find the probability that the person chosen has an ARI score that is less than 56.25. Show your work and write your answer in the box. (b) If someone has an ARI score of 57.84, what is their percentile rank? Show your work and write your answer in the box