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Median from Frequency Tables Flashcards
GCSE Mathematics (Edexcel) 1MA1
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Median
The middle value in a data set when the values are arranged in order.
Frequency Table
A table that shows how often each value or group of values occurs in a data set.
Cumulative Frequency
A running total of the frequencies, used to find the position of the median.
How to find the median from a frequency table
1. Calculate the cumulative frequency. 2. Find the position of the median using (n+1)/2. 3. Identify the group containing the median.
Position of the median
The position of the median is found using the formula (n+1)/2, where n is the total frequency.
Cumulative frequency column
A column added to the frequency table to calculate the running total of frequencies.
Grouped frequency table
A frequency table where data is grouped into intervals or classes.
Median class
The group or interval in a grouped frequency table that contains the median value.
Why use cumulative frequency?
Cumulative frequency helps to determine the position of the median in a data set.
What to do if the data is ungrouped
If the data is ungrouped, arrange it in order and find the middle value directly.

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