Unit 1 Review

1
Unit 1 Review

• Take out notes, pencil, calculator and your brain!

2
Stem-and-Leaf Plot

• Create a Stem-and-Leaf Plot for the following
  test scores
• 70, 89, 72, 100, 94, 89, 85

3
Stem-and-Leaf Plot (Answer)

• STEM (Tens) LEAVES (Ones)
• 7 0 2
• 8 5 9 9
• 9 4
• 10 0

4
Stem-and-Leaf Plot

• Calculate the Mean and Median for the
  Stem-and-Leaf Plot.
• Round to the nearest tenth

5
Landmarks of data

• Median 89
• Mean
• 708972100948985599
• 599 / 7 85.6

6
Mean or Median?

• The following represents the salaries at
  Hammarskjold Company
• 150, 000 37, 000
• 35, 000 30, 000
• Which landmark, the mean or median, better
  represents the salaries at this company? Explain.

7
Mean or Median?

• ANSWER
• Mean 63,000
• Median 36,000
• The Median is better since most salaries of the
  employees make around 36,000.

8

• The graph shows the number of students attending
  the math lab per quarter.
• How many more students attended in 3rd quarter
  than in the 4th quarter? Explain.

9
Bar Graphs

• Answer
• 3rd quarter 35
• 4th quarter 20
• 35- 20 15

10
What is the interval on the graph?
11
Landmarks of Data

• Find the median for the following set of data
• 32, 108, 25.5, 23

12
Landmarks of Data

• 23, 25.5, 32, 108
• 25.5 32 57.5
• 57.5 / 2 28.75

13
Median

• When calculating the median of a set of data,
  when do you need to add and divide by 2?

14
Median

• ANSWER
• Add and divide by 2 when there is an even set
  of numbers.

15
Mean

• Explain in words how you would find the mean of a
  set of data.

16
Mean

• You would add the data points together, then
  divide by the amount of data points that you have.

17
Landmark Sharks

• Which landmark
• RANGE, MEDIAN or MODE
• will show the highest score for your hand?
• 1, 2, 5, 8, 10

18
Landmark Sharks

• ANSWER
• Range 9
• Median 5
• Mode None
• The Range will give the highest score.

19
Average Rainfall in Inches
Average Rainfall

• During which season was the average rainfall 15
  inches?

20
Average Rainfall
Between which two seasons did the rainfall
increase the most?
21
Line PlotsDraw the Line Plot in your notes

• X
• X
• X X X
• X X X X
• ------------------------------------------
• 0 1 2 3 4 5

22

• X
• X
• X X X
• X X X X
• -------------------------------------------
• 0 1 2 3 4 5

Calculate the landmarks
23
Line Plot Answers

• Minimum 0
• Maximum 5
• Range 5-0 5
• Median 1
• Mode 0
• Mean 1 8/9

24
50, 67, 45, 90, 100

• Statement The mean of this set of data is 44.
  True or false? Explain.

25
Circle Graphs

• Use the circle graph
• 6th Graders Favorite Breakfast
• to measure the percentage of each breakfast.
• (Hint what should the entire circle add up to?)

26
Circle Graphs

• ANSWER
• Eggs 45
• Cereal 20
• Waffles 25
• Pancakes 10
• TOTAL 100

27
The End.

• Remember to bring home all math materials to
  study.
• You will need pencil and calculator for the test.