Square root of detion is also called as ?

Ans. is 'a' i.e., Standard detion o Standard detion is square root of mean detion, so it is also known as "Root - means - square - detion". o The steps for calculating SD are ? a) First calculate mean (y) b) Then deduct this mean from each value to obtain detion from mean (x - .T) as we did in calculating mean detion (see above). c) Now square, each detion (x - )7)2 d) Add up the squared detions --> S (x - 7)2 e) Divide the result by the number of values (observations), i.e. n . f) At the end, take square root, which gives the standard detion.