Mean and Standard Deviation of a Frequency Distribution on the TI-83/84 Calculators 1) First, add up all the number of frequencies that occur within this distribution, this is your n: n = ________ 2) Assign your x values to List 1 in your calculator, and your class midpoint values to List 2 in your calculator. These can be found under [STAT] → Edit. 3) Go to the title of List 3, and type: L1 * L2. 4) Press [STAT] → Calc → 1:1-VAR STATS . 5) Enter that you want the 1-VAR STATS for L3. 6) Take the line Σx and divide it by n is your μ; write it down Σx₁ = _______ μ = ________ 7) Go back to [STAT] → Edit 8) In the title of List 4, enter the following: L1²*L2 9) Once again, press [STAT] → Calc → 1:1-VAR STATS 10) Enter that you want the 1-VAR STATS for L4. 11) Write down the line Σx once more Σx₂ = ________ 12) Take Σx₂ and multiply it by n, take this result and subtract (Σx₁)²; divide this result by [n(n-1)] and then take the square root. 13) This is your standard deviation: σ = _________ Middlesex Community College | Prepared by: Stephen McDonald

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