🟧 Single Variable Data Flashcards
(8 cards)
What are summary statistics?
Measures such as mean, median, mode, range, interquartile range (IQR), and standard deviation that describe data sets.
What are common ways to represent single-variable data?
Histograms, dot plots, box-and-whisker plots, and stem-and-leaf plots.
How do you find the median of a dataset?
Arrange the data in numerical order, then:
- If there is an odd number of values, the median is the middle value.
- If there is an even number of values, the median is the average of the two middle values.
What is the interquartile range (IQR)?
The IQR is the difference between the first quartile (Q1) and the third quartile (Q3).
It measures the spread of the middle 50% of the data.
How do you calculate the mean of a dataset?
Add all the values together and divide by the number of values
Find the median of the following dataset:
7,9,2,5,12,10,4
Dataset:
7, 9, 2, 5, 12, 10, 4
Step 1: Arrange the numbers in order:
2, 4, 5, 7, 9, 10, 12
Step 2: Find the middle number (since there are 7 values):
The median is the 4th number → 7
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Calculate the mean of the following set of numbers:
3,7,12,15,8
Dataset:
3, 7, 12, 15, 8
Step 1: Add the numbers:
3+7+12+15+8=45
Step 2: Divide by how many numbers:
45/5 = 9
A student records the following scores on five tests:
80, 85, 92, 90, 87.
What is the range of the scores?
Scores:
80, 85, 92, 90, 87
Range = Highest – Lowest
92−80= 12
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