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The mean starting salary offered to graduating students with a certain major in a recent year was $64,245 with a standard deviation of $3643. A

The mean starting salary offered to graduating students with a certain major in a recent year was $64,245 with a standard deviation of $3643. A random sample of 75 of that year's graduating students with the major has been selected. What is the probability that the mean starting salary offered to these 75 students was $63,500 or less

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