Question

The population standard deviation is the a. Square of the population variance b. square root of the sum of the deviations from the mean c. same as the expected value d. positive square root of the population variance

Variance is a measure of the average, or central value of a random variable.

True

False

Answer 1

the above given question is a choose the correct answer

so we ahve below the proof and the correct answer so now

It is denoted by and s.

The answer is positive square root of the variance .

Standard deviation

= ( X - )² / n

s = ( X - )² / n - 1

The answer is the sum of the squared deviation of data elements from the mean

option B is the correct answer

Variance :

= ( X -  )² / n

= ( X - )² / n - 1