### Box & Whisker Plot Notes 1/31-2/1

```Box & Whisker Plot
Notes
Absent
1/31-2/1
Vocabulary for box and whisker plots
min.
Lower
Quartile
Median
Inter Quartile
Upper
Quartile
max.
Mr. Halls test scores:
Example 1
• Step 1: Put test scores
least to greatest.
77, 99, 100, 67, 90, 55, 86,
78, 72, 48, 27, 88, 24, 95
60, 63, 82, 94, 82
• Step 2: Make a number
24, 27, 78, 55, 60, 63, 67, 72, 77, 78, 82,
82, 86, 88, 90, 94, 95, 99, 100
• Step 3: Put a dot at the
20
30
40
50
60
70
80
line with test scores.
90
100
min. and max. test score.
• Step 4: Make a line at the
median test score.
• Step 5: Make a line at the
24
Range:
60
78
76%
Inter Quartile range:
30%
90
100
lower and upper quartiles.
Take the median of the
lower half and upper half
of test scores.
• Step 6: make a box with
the lines.
Questions from example 1
1. What percent of students scored higher than 78%?
50% scored higher
2. What percent of students scored higher than 60%?
75% scored higher
3. What percent of students scored lower than 60%?
25% scored lower
4. What percent of students scored higher than 90%?
25% scored higher
5. What percent of students scored lower than 90%?
75% scored lower
6. What percent of students scored 24% or higher?
100% scored higher
Example 2
• Mrs. Hall’s test scores:
47, 65, 50, 56, 68, 51, 36, 63, 45, 53, 59
36, 45, 47, 50, 51, 53, 56, 59, 63, 65, 68
• Step 1: Put test scores
least to greatest.
• Step 2: Make a number
line with test scores.
• Step 3: Put a dot at the
min. and max. test score.
30
40
50
60
70
• Step 4: Make a line at the
median test score.
• Step 5: Make a line at the
36
47
53
Range:
32 %
Inter Quartile range:
63
68
lower and upper quartiles.
Take the median of the
lower half and upper half
of test scores.
• Step 6: make a box with
the lines.
16%
```