Robertson Employment Service customarily gives standard intelligence and aptitude tests to all people who seek employment through the firm. The firm has collected data for several years and has found that the distribution of scores is not normal, but is skewed to the left with a mean of 86 and a standard devistion of 16. What i sthe probability that in a sample of 75 applicants who take the test, the mean score will be less than 84 or greater than 90?
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