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Business Weekly conducted a survey of graduates from several top MBA programs. On the basis of the survey, assume the mean annual salary for graduates 10 years after graduation is $175,000. Assume the standard deviation is $33,000. Suppose you take a simple random sample of 19 graduates. Round all answers to four decimal places if necessary. . What is the standard deviation of distribution of X? . What is the standard deviation of X? . For a single randomly selected graduate, find the probability that her salary is between $169,844 and $173,629. I . For a simple random sample of 19 graduates, find the probability that the average salary is between $169,844 and $173,629. . For part d), is the assumption of normal necessary? O NoO Yes Submit