Casio fx-CG50 field manual for IB Math
Descriptive stats with frequency table
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.
From the MAIN MENU, open Statistics. If you're already inside another app, press first to get back to MAIN MENU.
Enter the values in List 1: 2, 4, 6, 8. Enter the matching frequencies in List 2: 3, 2, 4, 1. Press after each entry.
Press (CALC), then (SET), and set 1Var XList = List1 and 1Var Freq = List2. Press , then (1-VAR) to compute.
The calculator gives xˉ=4.6, sx≈2.12, σx≈2.01, and n=10. Scroll down for the five-number summary.
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.