Home
Class 12
MATHS
In a series of 2n observations, half of ...

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

A

`(1)/(n)`

B

`sqrt2`

C

2

D

`(sqrt2)/(n)`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Similar Questions

Explore conceptually related problems

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 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 .

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

2×2×2 is equal to?

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

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

If the sum of the squares of deviations for 10 observations taken from their means is 2.5, then write the value of standard deviation.

The mean and variance of 5 observations are 6 and 6.8 respectively. If a number equal to mean is included in the set of observations is k, then the value of (34)/(k) is equal to