Definitions
This is the middle value of a data set when the numbers are arranged in order.
Median
In a boxplot, the line in the middle of the box represents this
Median
The following stemplot shows the waiting times (in minutes) for customers at a coffee shop:
2 | 0 1 2 3 4 5 6 7 8 9
3 | 0 1 2 3 4 5 6 7 8 9
4 | 0 1 2 3 4
Question: Based on the stemplot, what can you determine about the waiting times at the coffee shop?
A. There are more customers who waited between 20 and 29 minutes than between 30 and 39 minutes. (Examining distribution based on tally marks)
B. The longest wait time was less than 45 minutes. \
C. The most common waiting time falls between 20 and 29 minutes. (Mode)
D. Half the customers waited for less than 34 minutes. (Median)
D
Find the mode of the data set: 4, 6, 8, 6, 3, 6, 9
6
This is the value that appears most frequently in a data set.
Mode
If Q1 is 15 and Q3 is 35, what is the interquartile range (IQR)?
20
12, 14, 16, 18, 22, 24
See teacher for answer
A data set has a minimum value of 15 and a range of 20. What is the maximum value?
35
This is the sum of all values in a data set divided by the number of values.
Mean
Calculate Q1 for the data set: 5, 7, 8, 12, 15, 18, 22.
7
Test scores for 10 students are: {23, 17, 89, 78, 92, 55, 42, 86, 67, 31}
Based on the stemplot, what can you determine about the test scores?
A. The highest score is in the 90s.
B. The lowest score is less than 20.
C. More students scored in the 70s than the 80s.
D. The median score is between 40 and 50.
A
12, 15, 22, 9, 18, 11
Median: 13.5
This graphical representation shows the distribution of a data set and includes the median, quartiles, and outliers.
Boxplot
In a box plot, what percent of data lies between the beginning and end of the box?
50%
If the leaves of a stemplot are 0, 2, 2, 5, 8, and the stems are 1, 2, what is the data set?
10, 12, 12, 15, 18, 20, 22
In a data set with an odd number of values, the median is the 5th value. How many values are in the data set?
9
This term refers to the values that divide a data set into four equal parts
Quartiles
The first quartile (Q1) represents this percentile?
25th percent
The following stemplot shows the jersey numbers of the players on a basketball team.
1 | 2 3 4 5 6 7 8 9
2 | 0 1
What information can you determine from the stemplot?
A. There are more players with jersey numbers in the teens than in the single digits.
B. No player has a jersey number higher than 21.
C. The most common jersey number is 1. (Mode)
D. Half the players have jersey numbers lower than 15. (Median)
B
A set of 5 numbers has a mean of 12. If one of the numbers is changed from 10 to 20, what is the new mean
14