The minutes the 3000 middle school students spend exercising per week was collected. the data was normally distributed with a mean of 244 with a standard deviation of 8.2. approximately how many studnets exercise between 230.85 and 262.8 minutes

Carla is saving money for a trip this summer. she already has some money in her savings account and will add the same amount to her account each week. at the end of 2? weeks, carla has? $130. at the end of 8? weeks, she has? $280. write a linear function in the form y=mx+b to represent the amount of money m that carla has saved after w weeks.