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Statistics

Use frequencies (how many times each value occurs)

Enter each value once with a count beside it instead of typing it over and over.

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If a value shows up many times, it is quicker to list it once and say how often it occurs. This is a frequency table.

The example is the values 1, 2, 3, 4 with frequencies 3, 1, 2, 4. That is ten numbers in all, with a total of 27 and a mean of 2.7.

Classic Graphing 84

Start on the main screen: Press 2nd then mode (QUIT) to get back to the home screen. Pressing clear on a menu also backs out of it.

  1. Type the values in L1 and the frequencies in L2.

    stat11enter2enter3enter4enter▶3enter1enter2enter4enter

  2. Open 1-Var Stats (STAT, CALC, option 1).

    stat▶1

  3. Move down to FreqList and enter L2 (2nd then 2). Then move down to Calculate and press enter.

    ▼2ndL22▼enter

You should seen counts every repeat, so it is 10, not 4.

Classic Graphing 84 key reference · Classic Graphing 84 manual

Classic Scientific 30

Start on the main screen: Press 2nd then mode (QUIT) to leave any menu or screen and return to the calculation screen.

  1. Type the values in L1 and the frequencies in L2.

    data1enter2enter3enter4enter▶▲▲▲▲3enter1enter2enter4enter

  2. Open the STAT menu and choose 1-Var Stats.

    2ndstatdata1enter

  3. On the FRQ row choose L2 with the right arrow, then press enter to calculate.

    ▶▶enter

You should see1:n=10 2:x̄=2.7

Classic Scientific 30 key reference · Classic Scientific 30 manual

Natural Scientific 991

Start on the main screen: Press MENU, then 1 (Calculate) to return to the main calculation screen. AC clears the line you are on.

  1. Turn on the frequency column: SHIFT, MENU for Setup, then Statistics (option 6) and On.

    SHIFTSETUPMENU61

  2. Open Statistics and choose 1-Variable. Type the values in x.

    MENU611=2=3=4=

  3. Move right, go back to the top, and type the frequencies in the Freq column.

    ▶▲▲▲▲3=1=2=4=AC

  4. Press OPTN and choose 1-Variable Calc.

    OPTN3

You should seex̄=2.7 Σx=27 Σx²=89

Natural Scientific 991 key reference · Natural Scientific 991 manual

Natural Color Graphing

Start on the main screen: Press MENU then 1 to open Run-Matrix, the main calculation screen. Press EXIT to back out of a bar or screen, and SHIFT then EXIT (QUIT) to return to the app start.

  1. Type the values in List 1 and the frequencies in List 2.

    MENU21EXE2EXE3EXE4EXE▲▲▲▲▶3EXE1EXE2EXE4EXE

  2. Choose CALC (F2), then SET (F4). Move down to Frequency and choose List 2, then leave with EXIT.

    F2F4▼2EXEEXIT

  3. Now press 1-VAR (F1).

    F1

You should seex̄=2.7 Σx=27

Natural Color Graphing key reference · Natural Color Graphing manual

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