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An employee gives a pre-employment evaluation to a large group of applicants. The scores are normally distributed with a mean of 154 and a standard deviation of 21. The employer wants to interview only those applicants who score in the top 15%. What should the cut-off score be for the interviews? (Round to nearest whole number).
176
181
166
173
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
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Probability that the entire batch will be rejected?
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Compute a 95% confidence interval for the mean using the formula and where is the mean of the ten random numbers.
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