Review Chapters 2 & 3

Topics Unit Conversions Percent of Percent more or less than Percent increase or decrease Absolute and relative change Absolute and relative difference Scientific Notation Putting numbers into perspective Types of Errors Size of Errors Precision vs Accuracy Index & CPI

1.Given that 1 meter equals yards, convert a 5 kilometer race into miles. 2.All the gold ever mined in the world would fit into a 60 foot cube. How many cubic inches is this? 3.Suppose you traveled 400 miles on one tank of gas. You paid $2.05 per gallon, and your tank needed 15 gallons of gas. How much does your car cost for gas per mile?

4. When you arrived in Paris, you exchanged 200 dollars for 125 euros. What is the exchange rate? You spent all but 12 euros. How many dollars will you get when you exchange back? 5. A certain square city is 20 miles on each side. If the population density is 3750 people per square mile, what is the population of the city?

6. Chevron stock rose from 90 to 95 last week. The absolute change is, and the relative change is percent. 7. Microsoft stock rose from 25 to 27 last week. Compare this to the change in Chevron.

8. A new outfit was marked down by 20 percent, and then put on sale for another 50 percent off. After 5 percent sales tax, the final cost was $ What was the original price? 9. If the Cardinals win 105 out of 162 games, what is their winning percentage? 10. Suppose John Kerry’s wife gets a nickel every time somebody in the US uses ketchup. Estimate how much money this is in a year. (the population of the US is about 300 million).

11. If light travels 186 thousand miles per second, how long does it take a beam of light to travel 93 million miles from the sun to the Earth? 12. If the human life expectancy is 75 years, determine the life expectancy in seconds. Use scientific notation to report your answer, using the correct number of significant digits.

The digital speedometer in my car reads 68.9 MPH, while my analog dial reads exactly 70. If my true speed is 69.7 MPH, which reading is more accurate? Which is more precise? Explain. Your grandmother stashed $1000 under the mattress back in 1973, when the CPI was Now the CPI is In today’s dollars, what was the purchasing power of that money when it was hidden? In your company, everyone received a raise this year. Certain executives, who were already making $200,000, got a $5,000 raise. You only got a $2,000 raise, bringing your salary to a paltry $50,000. Is this fair?