Please help with C

Assume the selling prices of homes in a particular community follow a normal distribution with a mean of $286,100 and a standard deviation of $47,900. Complete parts a through c. 3. Determine the range of selling prices in this community that includes one standard deviation around the mean. The range is from $ 238,200 to $ 334,000 . (Type integers or decimals. Use ascending order.) b. Determine the range of selling prices in this community that includes two standard deviations around the mean. The range is from $ 190,300 to $ 381,900 . (Type integers or decimals. Use ascending order.) c. Determine the range of selling prices in this community that includes three standard deviations around the mean. The range is from $ to $ . (Type integers or decimals. Use ascending order.)