Mathematics
Weighted average
Combine two values with their relative weights.
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522 calculatorsStatistics calculators.
Find patterns, summaries and relationships in data.
Browse the statistics category subset →37 calculators · Star a calculator to find it in Favorites.
Mathematics
Probability
Find the probability of an event with equally likely outcomes.
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Arithmetic mean
Calculate the arithmetic mean of a list of numbers. See the sum, number of observations and division steps.
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Median
Find the middle of an ordered ungrouped data set.
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Data range
Measure the spread between the smallest and largest values.
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Combinations · nCr
Calculate combinations · ncr and see the working behind your result.
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Permutations · nPr
Calculate permutations · npr and see the working behind your result.
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Binomial probability
Calculate binomial probability and see the working behind your result.
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Conditional probability
Calculate conditional probability and see the working behind your result.
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Population variance
Calculate population variance and see the working behind your result.
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Population standard deviation
Calculate population standard deviation and see the working behind your result.
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Z-score
Z-score: use observed value, population mean, population standard deviation. Review the formula, worked example and calculation steps.
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P-value · standard normal z test
P-value · standard normal z test: use z test statistic, alternative hypothesis. Review the formula, worked example and calculation steps.
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Confidence interval · known population deviation
Confidence interval · known population deviation: use sample mean, known population standard deviation, sample size. Review the formula, worked example and calculation steps.
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Sample size · population proportion
Sample size · population proportion: use confidence level, margin of error, expected population proportion. Review the formula, worked example and calculation steps.
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Sample standard deviation
Sample standard deviation: use sample values. Review the formula, worked example and calculation steps.
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Mean, median, modes & range
Mean, median, modes & range: use data values. Review the formula, worked example and calculation steps.
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Mode
Mode: use observations. Review the formula, worked example and calculation steps.
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Standard error of the mean
Standard error of the mean: use observations. Review the formula, worked example and calculation steps.
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Pearson correlation
Pearson correlation: use x observations, y observations. Review the formula, worked example and calculation steps.
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Linear regression
Linear regression: use x observations, y observations, x value for prediction. Review the formula, worked example and calculation steps.
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Covariance
Covariance: use x observations, y observations, estimator. Review the formula, worked example and calculation steps.
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Geometric mean
Geometric mean: use observations. Review the formula, worked example and calculation steps.
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Harmonic mean
Harmonic mean: use observations. Review the formula, worked example and calculation steps.
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Coefficient of variation
Coefficient of variation: use observations. Review the formula, worked example and calculation steps.
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Weighted mean · data lists
Weighted mean · data lists: use values, weights. Review the formula, worked example and calculation steps.
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Percentile
Percentile: use observations, percentile. Review the formula, worked example and calculation steps.
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Interquartile range
Interquartile range: use observations. Review the formula, worked example and calculation steps.
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Outlier fences
Outlier fences: use observations. Review the formula, worked example and calculation steps.
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Expected value
Expected value: use outcomes, probabilities. Review the formula, worked example and calculation steps.
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Normal distribution
Normal distribution: use observation, mean, standard deviation. Review the formula, worked example and calculation steps.
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p-value · normal & Student t
p-value · normal & Student t: use test statistic, null distribution, degrees of freedom (t only). Review the formula, worked example and calculation steps.
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One-sample z test
One-sample z test: use sample mean, null mean, known population standard deviation. Review the formula, worked example and calculation steps.
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Poisson probability
Poisson probability: use expected count λ, observed count k. Review the formula, worked example and calculation steps.
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Exponential distribution
Exponential distribution: use rate λ, elapsed quantity. Review the formula, worked example and calculation steps.
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Uniform distribution
Uniform distribution: use lower bound, upper bound, observation. Review the formula, worked example and calculation steps.
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Relative frequency
Relative frequency: use count for the category, total observations. Review the formula, worked example and calculation steps.
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Useful answers. Clear assumptions.
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