# TI-BASIC:Median

**Command Summary**

Finds the median of a list.

**Command Syntax**

median(*list*,[*freqlist*])

**Menu Location**

Press:

- 2ND LIST to enter the LIST menu.
- LEFT to enter the MATH submenu.
- 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.

# Advanced Uses

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.