Results
What this Casio statistics calculator does
This tool is designed to mirror the most useful 1-variable statistics outputs you normally get in Casio STAT mode (such as on fx-991EX, fx-570ES PLUS, and similar models). Instead of jumping through menu screens, you can paste your data and instantly view core values used in homework, exams, and quick analysis.
- Count (n)
- Sum (Σx) and squared sum (Σx²)
- Mean (x̄)
- Population and sample variance
- Population and sample standard deviation (σx and sx)
- Minimum, quartiles, median, maximum
- Range and mode
How to use the calculator
1) Enter your data list
Paste your raw values into the Data values (X list) box. You can separate values by commas, spaces, or line breaks.
For instance: 10, 12, 14, 16, 18.
2) Add frequencies if needed
If your data is in grouped form (for example, value 20 appears 5 times), use the frequency box. This works similarly to turning FREQ on in a Casio statistics table.
3) Click “Calculate Statistics”
The result table appears immediately. If your input has a formatting issue, the calculator shows an error message and tells you what to fix.
Matching Casio calculator outputs
On many Casio models, you open STAT mode, choose 1-variable statistics, enter X values (and FREQ if enabled), then run variable calculations. This web calculator follows that same workflow conceptually.
- x̄ here corresponds to Casio mean output.
- σx is population standard deviation.
- sx is sample standard deviation.
- Q1 / Med / Q3 align with quartile-style summary values often used for box plots.
Formulas used
Mean
x̄ = Σx / n
Population variance and standard deviation
σ² = Σ(x - x̄)² / n and σ = √σ²
Sample variance and standard deviation
s² = Σ(x - x̄)² / (n - 1) and s = √s²
Common mistakes to avoid
- Entering letters or symbols in data (only numeric values are allowed).
- Providing a frequency list with a different length than the X list.
- Using zero or negative frequencies.
- Confusing sample SD (
sx) with population SD (σx).
When this tool is most useful
This is great when you need a quick check against your Casio result, want a cleaner way to paste long datasets, or need to verify classwork before submission. It is also handy for teachers preparing answer keys and students practicing AP Statistics, college intro stats, and business math.