Mean, Median, Mode
Find the mean: 4, 6, 8
6
What does the line inside the box represent?
Median
What does the stem represent?
The tens place (or leading digits)
What does “center” describe?
The middle of the data
What is a cluster?
A group of data close together
Find the median: 3, 5, 7, 9
6
What are the edges of the box called?
Q1 & Q3 (Lower & Upper Quartiles)
What does the leaf represent?
The ones place (or last digit)
What does “spread” describe?
How spread out the data is
What is a gap?
A space where no data exists
Find the mode: 2, 4, 4, 5, 6
4
What is the interquartile range (IQR) if Q1 = 10 and Q3 = 20?
10
Data: 12, 15, 18
Stem = 1 → leaves = ?
2,5,8
Find the range: 5, 8, 12, 20
15
What is an outlier?
A value far from the rest
Find the mean: 5, 10, 15, 20
12.5
Which part shows the middle 50% of data?
The Box
How many data values are in this plot?
1 | 2 3 5
2 | 0 4
5
Which measure is best when there are outliers: mean or median?
Median
Which of these is an outlier:
5, 6, 7, 8, 30
30
The mean of 5 numbers is 10. The first four are 6, 8, 10, 12. What is the 5th number?
14
If a value is 30, Q1 = 10, Q3 = 20, IQR = 10 → is 30 an outlier?
Yes
What is the median of:
1 | 2 3 5
2 | 0 4
15
Which measure describes spread using quartiles?
IQR
Data: 2, 3, 4, 20, 21, 22
How many clusters are there?
2 clusters