Review Chapters 2

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ReviewChapters 2 3
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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

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1. Given that 1 meter equals 1.094 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?

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• 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?

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• 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.

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• 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
  25.20. What was the original price?
• 9. If the Cardinals win 105 out of 162 games,
  what is their winning percentage?
• 10. Suppose John Kerrys 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).

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• 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.

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• 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 44.4. Now the CPI
  is 200.6. In todays 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?