Interestingly, in real life, no statistician calculates the **standard deviation without calculator**. Calculations are a bit complicated and there is a high risk of mistake. Also, it would be slow to calculate without calculator. It's so slow ...

The **standard deviation calculator** is basically one of the statistical representations such as charts, graphs - graphs of lines and columns. That is to say, it provide us make accurate comments about our grouped datas. If we explain it more detail ;

The **standard deviation** indicates how far away the data is from the arithmetic mean. If the arithmetic averages of the two data groups are equal or very close to each other, we can not make a clear comment on the successes and risk situations of the groups. In this case, we can use the **standard deviation calculator**.

The** standard deviation calculator** formula may seem complicated, but you will understand it when explain.

Step 1: Find the average.

Step 2: Find the distance from the center of each data point to the center.

Step 3: Add the values from step 2.

Step 4: Divide by the number of data points.

Step 5: Take the square root.

You need to know some terms in the **standard deviation calculator** :

The median is the number middle when a series of numeric data is sorted. The mode is the most repeated number when the data set is sorted from small to large. Openness is the difference between the largest value and the smallest value. Interquartile range is the difference between the upper quartile and the lower quartile.