Mi primo, quiere ser mayor que yo, me dice que un ratón grande la puso allí en el cielo.
No entiendo pero creo que es así
English so we can all understand
1. Work out the Mean (the simple average of the numbers)
2. Then for each number: subtract the Mean and square the result.
3. Then work out the mean of those squared differences.
4. Take the square root of that and we are done!