Foresters periodically cruise a forest to determine the size (usually measured as the diameter at breast height)

Question:

Foresters periodically “cruise” a forest to determine the size (usually measured as the diameter at breast height) of a certain species of trees. The breast height diameters (in meters) for a sample of 28 trembling aspen trees in British Columbia’s boreal forest are listed here. Determine whether the sample data are from an approximately normal distribution.