Teachers & educators
Class average calculator.
Mean, median, mode, spread and pass rate for a set of test scores.
Inputs
Result
Enter your numbers.
How do I find the class average, median and standard deviation?
The class average is the sum of the scores divided by the number of scores. The median is the middle score once sorted, or the mean of the two middle scores when the count is even. The standard deviation is the square root of the variance. The sample version divides the squared deviations by N − 1, as in the NIST handbook; the population version divides by N. Use the population value when the scores are the whole class you care about and the sample value when they stand in for a bigger group.
Worked example. Scores 70, 80, 90 and 100 average 85 with a median of 85. The sample standard deviation is 12.91 and the population standard deviation is 11.18.
Frequently asked questions
How do I calculate a class average?
Add every score and divide by the number of scores. Paste the scores above and the tool does it for you.
Should I use the mean or the median for a class?
The mean uses every score but is pulled by a few very low or high ones. The median is the middle score and is less affected. The tool shows both.
Population or sample standard deviation?
Population divides by N and describes exactly the scores you entered. Sample divides by N minus 1 and is used when the scores are a sample of a larger group. Both are shown.
What is a good standard deviation for test scores?
There is no good or bad value. It describes spread: a small value means scores are close together and a large one means they are far apart.
Sources
Checked
Mean, median, mode and range are arithmetic definitions. Standard deviation follows the NIST/SEMATECH e-Handbook formula. Runs entirely in your browser. Nothing you type is sent or stored.
Scope
Statistics describe the scores you enter. They do not by themselves say how well students learned. Not professional advice.