I want the show the works step by step for Aand B Autism is a serious and lifelong disability that is characterized by a severely decreased ability to engage in communication and social interaction. In 1998 citizens in a New Jersey town were concerned about the number of children diagnosed with autism, and a study was undertaken to establish the prevalence in the community. The citizens were concerned about possible environmental factors that might be causing the autism, as well as establishing an appropriate level of educational and social services for the autistic children. Data from this study are reported below: Calculate the prevalence rate of autism for these children for the two age categories. Convert the prevalence rate to a rate per 1,000. Show Your Work Solution Answer: A. Prevalence rate = (Number of cases of disease present in the population at a specified time) / (Number of persons at risk of having the disease at that specified time) Age category 3-5: Prevalence rate = 19 / 3479 = 0.00546 = 0.546% Age category 6-10: Prevalence rate = 17 / 5417 = 0.003138 = 0.3138% B. Prevalence rate / 1000: Age category 3-5: Prevalence rate / 1000 = 0.546% * 1000 = 0.546 * 1000 / 100 = 5.46 Age category 6-10: Prevalence rate / 1000 = 0.3138% * 1000 = 0.3138 * 1000 / 100 = 3.138.