Weighted Mean TI-84 | TI-83 Example

To help our viewers calculate a weighted mean with their TI-84 or TI-83 calculator.  We will do a sample problem using the information bellow.

Data Value : use L2 Weight : use L3
1 3
2 2
3 1
4 4
5 1
6 2
7 2
8 3
9 2
  • Input the above in your Ti-84 or TI-83 calculator
    Instructions on how to Create a List TI-84 | TI-83 tutorial.  (In this example we will store the data in L2.  We will then store the weighted value into L3.)
  • Use 1-var stats to find the weighted mean.
    | [STAT] | [RIGHT] | [ENTER] | [2nd] | [ 2 ] | [ , ] | [2nd] | [ 3 ] | [ENTER] |
    Setting up TI-84 to calculatoe frequency mean
    TI-84 Frequency mean, using 1-var stats
  • Note: Some TI-84 Plus Silver Editions have an different operating system.  If you have a screen that prompts you for the List and FreqList due the following:
    | [STAT] | [RIGHT] | [ENTER] | [2nd] | [ 2 ] | [ENTER] | [2nd] | [ 3 ] | [ENTER] | [ENTER]

Note: the weighted mean formula and the frequency distribution formula use the same calculations.  This is why they closely resemble each other.

Well Done!  You have learned how to solve the a sample test question on the weighted mean.

Last Modified on September 7, 2013 by JoeStat


  1. I have a TI-84 plus silver. It doesn’t allow me to place the comma between L1 and L2. Any ideas?

    • The comma key is located directly above the 7 key. I just used my TI-84 Plus Silver calculator and had no problems with this method.

      If the error you get is: DIM Mismatch, then the data wasn’t entered correctly. Check to make sure that there isn’t any duplicate or missing fields in your table.

      Note: Using L1, L2 would give this error if you were following the tutorial, because L1 has more data then L2.

      Let me know if this helps. Good luck!

      • I am having the same problem with the comma! When entering in 1-Var Stats I cannot enter a comma between L1 and L2. I can however enter a J in Alpha mode. Which has to mean the key is working… totally lost here!
        Any hints for a newbie?

        • What a headache. After further investigation, I have discoverred that two different TI-84 Silver Editions may have a different prompts for completing the Stat functions. One is the same uses the standard method, the other has a different prompt. I have included updated the Weighted Mean page to include instructions for both solutions.

          I have tested on a TI-83 Plus, TI-84, TI-84 Plus Silver Edition and TI-89. If you are still having trouble, please provide the model of your calculator. That way I verify/create/test a solution. I appreciate your feedback and would love to improve your statistic knowledge.

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