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# (Solved) MATH225 Week 5 Assignment : Understanding the Empirical Rule

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Question

A random sample of CO2 levels in a school has a sample mean ofÂ xÂ¯=598.4Â ppm and sample standard deviation ofÂ s=86.7Â ppm.Â  Use the Empirical Rule to determine the approximate percentage of CO2 levels that lie betweenÂ 338.3Â andÂ 858.5Â ppm.

Question

A random sample of small business stock prices has a sample mean ofÂ xÂ¯=\$54.82Â and sample standard deviation ofÂ s=\$8.95.Â  Use the Empirical Rule to estimate the percentage of small business stock prices that are more thanÂ \$81.67.

Question

A random sample of vehicle mileage expectancies has a sample mean ofÂ xÂ¯=169,200Â miles and sample standard deviation ofÂ s=19,400Â miles.Â  Use the Empirical Rule to estimate the percentage of vehicle mileage expectancies that are more thanÂ 188,600Â miles.

Question

A random sample of hybrid vehicle fuel consumptions has a sample mean ofÂ xÂ¯=53.2Â mpg and sample standard deviation ofÂ s=4.8Â mpg.Â  Use the Empirical Rule to estimate the percentage of hybrid vehicle fuel consumptions that are less thanÂ 43.6Â mpg.

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