The deciles of any distribution are the 10th, 20th, . . . , 90th percentiles. The first and last deciles are the 10th and 90th percentiles, respectively.
What are the first and last deciles of the standard Normal distribution?
The weights of 9-ounce potato chip bags are approximately Normal with a mean of 9.12 ounces and a standard deviation of 0.15 ounce. What are the first and last deciles of this distribution?