The length of human pregnancies from conception to birth approxi- mates a normal distribution with a mean of 266 days and a standard deviation of 16 days. Find the interval centered at mean which covers approximately 68% of the probability. (a) (266- 1x 16, (b) (266-2 x 16, (c) (266-3 x 16, (d) (266- 4 x 16, 266 + 1 x 16) 266 +2 x 16) 266 +3 x 16) 266 +4 x 16)

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