Home
Class 11
MATHS
In a series of 20 observations 10 observ...

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

Text Solution

Verified by Experts

The correct Answer is:
2
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • STATISTICS

    CBSE COMPLEMENTARY MATERIAL|Exercise Section - D (Long Answer Type-II Questions) (6 Mark)|10 Videos

  • STATISTICS

    CBSE COMPLEMENTARY MATERIAL|Exercise Section - B (Very Short Answer Type Questions) (2 Mark)|5 Videos

  • SETS AND FUNCTIONS

    CBSE COMPLEMENTARY MATERIAL|Exercise LONG ANSWER TYPE QUESTIONS|21 Videos

  • STRAIGHT LINES

    CBSE COMPLEMENTARY MATERIAL|Exercise SECTION-D (LONG ANSWER TYPE QUESTIONS )|23 Videos

Similar Questions

Explore conceptually related problems

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

If standard deviation of a set of observation is 4 and if each of the observations is divided by 4, then the standard deviation of new set of observations is

Knowledge Check

  • 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)`

  • 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 |a| is equal to

    A
    `(1)/(n) `
    B
    `sqrt2`
    C
    `2`
    D
    `( sqrt2)/(n)`

  • Find the standard deviation of 10 observations 111, 211, 311,..., 1011

    A
    `100sqrt(3)`
    B
    250
    C
    300
    D
    `50sqrt(33)`

    • Similar Questions

    Explore conceptually related problems

    Out of 30 observations , 10 observations are (1/2-d) and 10 observations are d and remaining 10 are (1/2+d) . If the variance of 30 observation is 4/3 then d is

    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 :

    Out of 30 observations 10 are equal to 70 -2alpha each, 10 are equal to 7 each and the remaining 10 are equal to 7+ 2alpha each. If standard deviations of the data is equal to 5sqrt((2)/(3)) then |alpha| is equal to _____________

    Standard deviation of four observations -1,0,1 and k is sqrt(5) then k will be

    Arithmetic mean of 10 observations is 60 and sum of squares of deviations from 50 is 5000, what is the standard deviation of the observation

    Home
    Profile