Chapter 12 Data Analysis and Probability

Chapter 12 Get Ready!

• Skills Handbook, p. 791 Adding and Subtracting Fractions

  Add or subtract. Write each answer in simplest form.

  1. 2 3 + 1 2 2 thirds , plus , 1 half
  2. 7 12 − 5 8 7 twelfths , minus , 5 eighths
  3. 16 25 + 3 10 16 over 25 , plus , 3 tenths
  4. 5 9 − 5 36 5 ninths , minus , 5 thirty sixths

• Lesson 1-6 Multiplying and Dividing Real Numbers

  Simplify each fraction.

  5. 6 + 4 + 7 + 9 4 fraction 6 plus 4 plus 7 plus 9 , over 4 end fraction
  6. 1.7 + 4.2 + 3.1 3 fraction 1.7 plus 4.2 plus 3.1 , over 3 end fraction
  7. 11 + 16 + 9 + 12 + 7 5 fraction 11 plus 16 plus 9 plus 12 plus 7 , over 5 end fraction

• Lesson 1-7 Distributive Property

  Simplify each expression.

  8. 6 ( x − 7 ) 6 open x minus 7 close
  9. 1 2 ( 4 x + 6 ) 1 half . open , 4 x plus 6 , close
  10. − 2 ( 5 − x ) negative 2 open 5 minus x close
  11. 0.5 ( 5 + 4 x ) 0.5 open 5 plus 4 x close

• Lesson 3-8 Unions and Intersections of Sets

  Let X = {x|x is an odd whole number less than 16}, Y = {2, 6, 9, 10, 16}, and Z = {z|z is an even whole number less than 19}. Find each union or intersection.

  12. X ∪ Y x union y
  13. X ∩ Y x intersection y
  14. Y ∩ Z y intersection z
  15. X ∪ Y ∪ Z x union y union z

• Lesson 5-7 Scatter Plots

  For each table, make a scatter plot of the data. Describe the type of correlation that the scatter plot shows.

  16. Messenger Bag Sales

      Price ($)	30	45	60	75
      Number Sold	150	123	85	50

  17. Driving Distances and Times

      Distance (mi)	5	38	15	8
      Time (min)	15	56	28	22

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