Without an automated irrigation system, the height of plants two weeks after germination is normally distributed with a mean of 3.5 centimeters and a variance of 0.2704 centimeter^2.  (a) What is the probability that a plant’s height is greater than 2.25 centimeters?  (b) If the specifications require the height is not shorter than 2.0 centimeters, what is the probability that a plant’s height is not accepted?  (c) What height is exceeded by 90% of the plants

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