A survey conducted to assess the ability of computer manufacturers to handle problems quickly (PC Computing, November 1997) obtained the results shown in the table: a.What is the mean, median, variance and standard deviation of days needed to resolve problems? b. Which manufacturer holds the best record? c. What is the z-score for Packard Bell? d. What is the z-score for IBM? e. Are there any outliers? .Company Days to Resolve Problems Company Days to Resolve Problems Compaq 13 Gateway 21 Dell 14 Digital 27 Quantex 11 IBM 12 Packard Bell 27 Hewlett-Packard 14 NEC 14 AT&T 20 AST 17 Toshiba 37 Acer 16 Micron 17
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