The median( Command

Command Summary

Finds the median of a list.

Command Syntax

median(list,[freqlist])

Press:

1. 2ND LIST to enter the LIST menu.
2. LEFT to enter the MATH submenu.
3. 4 to select median(, or use arrows.

TI-83/84/+/SE

1 byte

The median( command finds the median of a list. It takes a list of real numbers as a parameter. For example:

``````:Prompt L1
:Disp "MEDIAN OF L1",median(L1```
```

That's not all, however. Awesome as the median( command is, it can also take a frequency list argument, for situations when your elements occur more than once. For example:

````:Disp median({1,2,3},{5,4,4})`
```

is short for

````:median({1,1,1,1,1,2,2,2,2,3,3,3,3})`
```

The frequency list {5,4,4} means that the first element, 1, occurs 5 times, the second element, 2, occurs 4 times, and the third element, 3, occurs 4 times.

Frequency lists don't need to be whole numbers. Amazing as that may sound, your calculator can handle being told that one element of the list occurs 1/3 of a time, and another occurs 22.7 times. It can even handle a frequency of 0 - it will just ignore that element, as though it weren't there. One caveat, though - if all of the elements occur 0 times, there's nothing to take the median of and your calculator will throw an error.

# Error Conditions

• ERR:DATA TYPE is thrown, among other cases, if the data list is complex, or if the frequencies are not all positive and real.
• ERR:DIM MISMATCH is thrown if the frequency list and the data list have a different number of elements.
• ERR:DIVIDE BY 0 is thrown if the frequency list's elements are all 0.

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