2. The height of grade 1 pupils are approximately normally distributed with u= 45 inches and a=2. a. If an individual pupil is selected at random, what is the probability that he or she has a height of 42 and 47? b. A class of 30 of these pupils is used as a sample. What is the probability that the class mean is between 42 and 47? C. Ha pupil is selected at random, what is the probability that is taller than 46 inches?

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