In a series of 2n observations, half of them equal a and remaining half equal -a. If the standard deviation of the observations is 2, then lal equals

In a series of 2n observations, half of them equals to a and remaining half equals to -a. If the standard deviation of the observations is 2, then find |a|.

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) sqrt2 (3) 2 (4) sqrt2/n

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 .

The standard deviation of the observations 22, 26, 28, 20, 24, 30 is

If mean of squares of deviations of a set of n observations about -2a n d2 are 18 and 10 respectively then standard deviation of this set of observations is 3 (b) 2 (c) 1 (d) None of these

If mean of squares of deviations of a set of n observations about -2a n d2 are 18 and 10 respectively then standard deviation of this set of observations is 3 (b) 2 (c) 1 (d) None of these

Calculate the variance and standard deviation of the observations : 11, 12, 13, . . . .. 20.

When the number of observations (n) is odd, then median is equal to

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