1. FREQUENCY TABLES, LINE PLOTS, & HISTOGRAMS

2. TERMS Frequency  number of times that something happens
**The key here is that frequency is always about the NUMBER of times
Frequency table  a table that shows the frequencies of items

3. EXAMPLE 1 A number cube was rolled 20 times. The results were:
Make a frequency table
of this data. 2 6 5 3 4 1

4. EXAMPLE 1 2 6 5 3 4 1
Number
Tally
Frequency 1 II 2
IIII 4 3
III 5 6

5. LINE PLOT To make a line plot:
Draw a number line that includes all the values (in example 1 this was 1,2,3,4,5,6)
2. Place an “X” above each number to indicate the number of times it occurs.

6. Number
Tally
Frequency 1 II 2
IIII 4 3
III 5 6 X X X X X X

7. HISTOGRAM A graph that shows the frequencies of the data
**Looks like a bar graph.

8. EXAMPLE 2
The number incorrect on the latest quiz in Mr. Marvel’s algebra class

9. EXAMPLE 2
Decide on an interval size (starts with 0 goes to 10) Interval size: 2

10. EXAMPLE 2
Decide on an interval size (starts with 0 goes to 10) Interval size: 2
2. Make a frequency table

11. EXAMPLE 2 4 1 10 5 2 2 1 1 9 1 7 0 2 3 3 1 0 4 8 4 Number Incorrect
Number
Incorrect
Tally
Frequency
0 – 1
IIII II 7
2 – 3
IIII 5
4 – 5 4
6 – 7 I 1
8 – 9 II 2

12. Frequency for the Number Incorrect
Tally
Frequency
0 – 1
IIII II 7
2 – 3
IIII 5
4 – 5 4
6 – 7 I 1
8 – 9 II 2
Frequency for the Number Incorrect 5
Frequency
0 – – – – –
Number Incorrect

13. Frequency for the Number Incorrect
Tally
Frequency
0 – 1
IIII II 7
2 – 3
IIII 5
4 – 5 4
6 – 7 I 1
8 – 9 II 2
Frequency for the Number Incorrect 5
Frequency
0 – – – – –
Number Incorrect

14. Frequency for the Number Incorrect
Tally
Frequency
0 – 1
IIII II 7
2 – 3
IIII 5
4 – 5 4
6 – 7 I 1
8 – 9 II 2
Frequency for the Number Incorrect 5
Frequency
0 – – – – –
Number Incorrect

15. Frequency for the Number Incorrect
Tally
Frequency
0 – 1
IIII II 7
2 – 3
IIII 5
4 – 5 4
6 – 7 I 1
8 – 9 II 2
Frequency for the Number Incorrect 5
Frequency
0 – – – – –
Number Incorrect

16. Frequency for the Number Incorrect
Tally
Frequency
0 – 1
IIII II 7
2 – 3
IIII 5
4 – 5 4
6 – 7 I 1
8 – 9 II 2
Frequency for the Number Incorrect 5
Frequency
0 – – – – –
Number Incorrect

17. Frequency for the Number Incorrect
Tally
Frequency
0 – 1
IIII II 7
2 – 3
IIII 5
4 – 5 4
6 – 7 I 1
8 – 9 II 2
Frequency for the Number Incorrect 5
Frequency
0 – – – – –
Number Incorrect

18. Frequency for the Number Incorrect
Tally
Frequency
0 – 1
IIII II 7
2 – 3
IIII 5
4 – 5 4
6 – 7 I 1
8 – 9 II 2
Frequency for the Number Incorrect 5
Frequency
0 – – – – –
Number Incorrect

19. Assignment
12.1: 1 – 17,