Consider the following 10 observations on the lifetime (in hours) for a certain type of power supply: 152.7, 172.0, 172.5, 173.3, 193.0, 204.7, 216.5, 234.9, 262.6, and 422.6. Construct a normal probability plot, and comment on the plausibility of a normal distribution as a model for power supply lifetime. (The normal scores for a sample of size 10 are -1.539, -1.001, -.656, -.376, -.123, .123, .376, .656, 1.001, and 1.539.)