Describe the center and spread of a set of numbers.
Find the arithmetic mean of a list of numbers, with the sum and range shown alongside it.
Open calculatorFor 1, 3, 7, 9 the median is (3 + 7) / 2 = 5.
Open calculatorFor 1, 2, 2, 3, 3 the modes are 2 and 3, each with frequency 2.
Open calculatorFind a percentile using an explicitly defined linear interpolation method.
Open calculatorFor −3, 2, 10 the range is 10 − (−3) = 13.
Open calculatorFor 2, 4, 4, 4, 5, 5, 7, 9 the mean is 5, population variance is 4 and population standard deviation is 2.
Open calculatorCombine values that contribute unequally to an overall average.
Open calculatorThe mean uses every value, the median locates the middle and the mode finds repeated values. Range shows endpoints; standard deviation describes spread around the mean. Choose population or sample variance according to what your dataset represents.