Question

Which of the following is true about standard deviation?

• A. It is a measure of spread of data about the mean.
• B. It is the cube root of sum of squared deviation from the mean divided by the number of observations.
• C. Both are correct
• D. None is correct

Answer 1

The correct option is A It is a measure of spread of data about the mean.

Since, ${\sigma }_x=\sqrt{\frac{\sum (X_i-\overline{X}{)}^2}{N}}$

We can say that

It is a measure of spread of data of data about the mean.