TI-84 Plus CE field manual for IB Math

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Descriptive stats with frequency table

All courses

Enter values in one table column and frequencies in a second column, run one-variable statistics with a frequency list, and read the weighted statistics.

Find the descriptive statistics for the frequency table with values 2, 4, 6, 8 and frequencies 3, 2, 4, 1.

Open the list editor: press and choose 1: Edit.

Enter the values in L1: 2, 4, 6, 8. Enter the matching frequencies in L2: 3, 2, 4, 1. Press after each entry.

Run one-variable statistics with frequencies: press , move to CALC, choose 1-Var Stats, set List = L1 (type L1 with ) and FreqList = L2 (type L2 with ), then choose Calculate.

NORMALFLOATAUTOREALRADIANMP
1-Var Stats
x̄=4.6
Σx=46
Σx²=252
Sx=2.118699811
σx=2.009975124
n=10
minX=2
Q1=2
Med=5
Q3=6
maxX=8

The calculator gives xˉ=4.6, Sx≈2.12, σx≈2.01, and n=10.

Your turn

Work each one on your calculator, then check the answer.

1
A frequency table has values 1, 2, 3, 4 with frequencies 5, 8, 4, 3. Find the mean and both standard deviations.
2
A frequency table has values 10, 20, 30, 40, 50 with frequencies 2, 5, 8, 4, 1. Find the mean and both standard deviations.
3
A frequency table has values 0, 1, 2, 3, 4 with frequencies 6, 10, 7, 4, 3. Find the mean and both standard deviations.