In a series of 2n observations, half of them are equal to `a^(2)` and the remaining half are equal to `-a^(2)`. If the standard deviation of the observation is 2, then `|a|` is equal to

In a series of 20 observations 10 observation each equal to k and each of the remaining half is equal to -k .If the standard deviation of the observations is 2, then write the value of k

Let in a series of 2n observations, half of them are equal to a and remaining half are equal to -a. Also by adding a b in each of these observation, the mean and standard deviation of a new set become 5 and 20 respectively. Then the value of a^2+b^2 is equal to :

In a series of 2n observations,half of them equal a end remaining half equal -a. If the S.D.of the observationsis 2, then |a| equals (1) (1)/(n) (2) sqrt(2)(3)2(4)(sqrt(2))/(n)

If mean of squares of deviations of a set of n observations about - 2 and 2 are 18 and 10 respectively,then standard deviation of this set of observations is

Let s be the standard deviation of n observations. Each of the n observations is multiplied by a constant c. Then the standard deviation of the resulting number is