5. In the following group frequency distribution, find the variance and standard deviation. Remember to use your shortcut formulas on your green formula sheet you received with your textbook. Ages (in years) of Best Actor when an Oscar was won. - 87 male actors, who won an Oscar, were selected and this grouped frequency table was obtained reflecting the age at which the Oscar was won for the particular sample. (Note - Extra columns in the table for your use.) Age (years) Frequency when Oscar was won 20 -29 1 30-39 28 40-49 36 50-59 15 60-69 6. 70-79 1 n = 87

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Workers' Distractions. A recent study showed that the modern working person experiences an average of 2.1 hours per day of distractions (phone calls, e- mails, impromptu visits, etc.). A random sample of 16 workers for a large corporation found that these workers were distracted an average of 1.8 hours per day and the standard deviation was 20 minutes. Estimate the true mean population distraction time with 90% confidence, and compare your answer to the results of the study. (1.654,1.946). Mean of the study is outside or "different" from the result of our study.