What is the probability that compliant type-I diabetic 12-year-old boys will gain at least 15 lbs. over 1 year? 

Diabetes

Physicians recommend that children with type-I (insulindependent) diabetes keep up with their insulin shots to minimize the chance of long-term complications. In addition, some diabetes researchers have observed that growth rate of weight during adolescence among diabetic patients is affected by level of compliance with insulin therapy. Suppose 12-year-old type-I diabetic boys who comply with their insulin shots have a weight gain over 1 year that is normally distributed, with mean = 12 lbs. and variance = 12 lbs.