Unformatted text preview: 7. 5% of the families spend below what value? X=(z* σ )+ x = (.05*12)+130 = 130.6 8. The top 5% of the families spend above what value? 9. Between what two values will the middle 50% of the families spend? 10. What percent of the families spend at least $120? 11. Use the empirical rule to determine the following: A About 68% of the observations lie between what two values? B About 95% of the observations lie between what two values? C About 99% of the observations lie between what two values? 12. Use the standard normal distribution to determine the following A 68% of the observations lie between what two values? B 95% of the observations lie between what two values? C 99% of the observations lie between what two values? 13. Discuss the differences in the results for question 12 and question 11...
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 Spring '10
 webster
 Normal Distribution, Standard Deviation, $12, $120, $140

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