Consider the following 10 observations on the lifetime (in hours) for a certain type of power supply:
Construct a normal probability plot, and comment on whether it is reasonable to think that the distribution of power supply lifetime is approximately normal. (The normal scores for a sample of size 10 are 21.539, 21.001, 20.656, 20.376, 20.123, 0.123, 0.376, 0.656, 1.001, and 1.539.)

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