In screening applicants for a position, testing is one device used, in addition to interviews and background investigations. Some tests focus on mechanical aptitudes and skills. One such test for manual dexterity administered to a large number of applicants showed that the time required for completion was approximately normally distributed with a mean of 15 minutes and a standard deviation of 1.9 minutes. Based on this information, (a) what proportion of applicants finish in less than 14 minutes? (b) If only the best 20% of applicants (using the dexterity test as the criterion of best) are to be passed through this screening stage, within what time must an applicant complete this test in order to pass?
2. In screening applicants for a position, testing is one device used, in addition to interviews and background investigations. Some tests focus on mechanical aptitudes and skills. One such test for manual dexterity administered to a large number of applicants showed that the time required for completion was approximately
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