The magazineConsumer Reports reported the usable capacity of 36 side-by-side refrigerators. Here is a dotplot showing the distribution of usable capacity for these refrigerators. The mean capacity is 15.825 cubic feet and the standard deviation is 1.217 cubic feet.

1. Describe the shape.
2. Calculate the percentage of values within 1, 2, and 3 standard deviations of the mean.
3. Based on your answers to parts a and b, is the distribution roughly normal? Explain your reasoning.