Measures of Central Tendency
What are the three measures of central tendency?
Mean, Median, Mode
8 - (-3)
11
What are the five values need to make a box-and-whisker plot?
Minimum, 1st quartile, median, 3rd quartile, maximum
This Stem and Leaf plot has ______ items of data.
Ages of Parents | |
Stem | Leaf |
3 | 1 4 4 9 |
4 | 0 0 0 1 2 3 5 7 |
5 | 2 3 |
Key: 3 1 = 31 years old
What is 14?
What is the mode: 5, 5, 9, 49, 11, and 5
What is 5?
Find the mean 20, 5 , 5, 20, 10, 10, 5, 5
10
-2 + 5 =
3
What are the minimum and maximum values of the data set: 78, 12, 109, 36, 121
12 and 121
Most student completed homework in this amount of time, according to this stem and leaf chart.
Time to Complete Homework | |
Stem | Leaf |
3 | 2 2 2 2 2 2 4 |
4 |
|
5 | |
6 | 9 |
7 | 6 8 |
8 | 4 |
Key: 3 2 = 32 minutes | |
What is 32 minutes.
Calculate this measure of central tendency by adding all the data values together and dividing the sum by the total number of data values.
What is the mean?
Find the median: 197, 56, 203, 79, 145, 2
112
-9 - (-3) =
6
What is the median of the data set: 72, 90, 84, 76, 68
76
What percentage is between the lower and upper quartiles?
50%
The mean of the data set of the number of books these five people own: 37, 50, 53, 17, 10, 49
36.
Which would be better to use with this data? Median or Mean and why?
0, 0, 2, 3, 2, 4, 3, 1, 1
Mean because there are no outliers
- 3 - 4 + 2
-5
What percent is between the minimum and the upper quartile?
75%
What is the lower quartile of the data?
1, 3 , 5, 7, 8, 8, 9
3
Find the median
20, 25, 15, 20 , 18, 17, 14, 19
18.5
Find the mean
1, 5, 6, 3, 5, 10
5
- 2 - (- 3) - 3
-2
What is the median?
22, 23, 25, 27, 27, 28
26
What is the upper quartile of the data?
1, 3, 5, 7, 8, 9
8
Find the mean
-3 , 2, -3, 4, -3, -1, 4
0