# Median calculator

For median calculation, please enter numerical data separated with comma (or space, tab, semicolon, or newline). For example: 104.5 520.4 393.8 534.2 160.5 512.3 349.3 -990.5 676.1 -749.9 432.0 516.4 385.5

### Median

The median separates the higher half of the ordered data sample (or data file) from the lower half.
The median is the 2nd quartile (Q2), 5th decile, and 50th percentile.

### How to calculate the median?

Sort data set with n elements and select n/2-th element. If the index n/2 is not an integer, then use interpolation between the surrounding elements (in this case median does not belong to the input data set).
For example, for n=10 elements, the median is equal to the 5th element. For n=50 elements, the median is equal to the 25th of the ordered data, etc.

### How to enter data as a frequency table?

Simple. Write data elements (separated by spaces or commas, etc.), then write f: and further write the frequency of each data item. Each element must have a defined frequency that counts numbers before and after symbol f: must be equal. For example:

1.1 2.5 3.99
f: 5 10 15

### How to enter grouped data?

Grouped data are formed by aggregating individual data into groups so that a frequency distribution of these groups serves as a convenient means of summarizing or analyzing the data.

 group frequency 10-20 5 20-30 10 30-40 15
This grouped data you can enter:
10-20 20-30 30-40
f: 5 10 15

### How to enter data as a cumulative frequency table?

Similar to a frequency table, but instead, f: write cf: in the second line. For example:

10 20 30 40 50 60 70 80
cf: 5 13 20 32 60 80 90 100

The cumulative frequency is calculated by adding each frequency from a frequency distribution table to the sum of its predecessors. The last value will always equal the total for all observations since the calculator will have already added all frequencies to the previous total.