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Unformatted text preview: 65 mph b) What percentage of cars go above 70 mph 2.5% c) What percentage of cars travel between 55- 75 mph? 83.85% 3) Scores on the IQ test for the 20 to 34 age group are approximately normally distributed with mu= 100 and standard deviation= 30. Use the 68-95-99.7 rule to answer these questions. a) About what percent of people in this age group have scores above 100? 50% b) About what percent have scores above 160? 2.5% c) In what range do the middle 95% of all IQ scores lie? 40-160 d) Approximately what percentage would score above 70 84% e) Approximately what percentage of this group score between 40 and 100 47.5% f) Approximately what percentage of this group score below 70 16%...
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