RMS stands for root square mean.

Root Mean Square, or quadratic mean, is a statistical function for finding the average of a series even if it contains negative numbers.

**Formula to calculate RMS.**

- Begin by squaring the number and add them together.
- Then divide the sum of the squares by the number of observations(n).
- And find the square root of the result.

**Example:**

Find the RMS of the student’s age as stated below.

12 years, 13 years, 12 years and 14 years.

n = 4

Therefore, your RMS is 12.78.