The weight gains of animals during a period of confinement follow a normal distribution of mean 39.0 and standard deviation 1.0 kg. Answer the following questions. a.What is the probability of randomly selecting an animal with a weight gain greater than 38.8 knowing that the value is less than 40.5 kg?  b. If we define as a normality range an interval of weight gain values symmetric around the mean that correspond to a probability of 0.90, what will be the upper limit of the range? c. What is the probability of randomly selecting an animal with a weight gain greater than 38.7 kg?

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