Home
Class 12
MATHS
The means and variance of n observation ...

The means and variance of n observation `x_1, x_2, x_3,....x_n` are 5 and 0 respectively . If ` sum_(i=1)^(n) x_(i)^(2) = 400`, then find the value of n

Text Solution

Verified by Experts

16
Promotional Banner

Topper's Solved these Questions

  • STATISTICS

    AAKASH SERIES|Exercise EXERCISE-5.3|5 Videos

  • STATISTICS

    AAKASH SERIES|Exercise EXERCISE-5.1|17 Videos

  • SETS AND RELATIONS

    AAKASH SERIES|Exercise PRACTICE EXERCISE|26 Videos

  • STRAIGHT LINES (3D)

    AAKASH SERIES|Exercise PRACTICE EXERCISE|28 Videos

Similar Questions

Explore conceptually related problems

The means and variance of n observations x_(1),x_(2),x_(3),…x_(n) are 0 and 5 respectively. If sum_(i=1)^(n) x_(i)^(2) = 400 , then find the value of n

The standard deviation of n observation x_1 , x_2, x_3 .....,x_n is 2. If sum_(i=1)^(n) x_(i)^(2)=100 and sum_(i=1)^(n) x_(i) = 20 show the value of n are 5 and 20

The standard deviation of n observations x_(1), x_(2), x_(3),…x_(n) is 2. If sum_(i=1)^(n) x_(i)^(2) = 100 and sum_(i=1)^(n) x_(i)^(2) = 20 show the values of n are 5 or 20

If x_(1), x_(2),…..x_(n) are n observations such that Sigmax_(i)^(2)=400 and Sigmax_(i)=80 then the least value of n is

If n=10 , sum_(i=1)^(10) x_(i)=60 and sum_(i=1)^(10) x_(i)^(2)=1000 then find s.d

sum_(n=0)^( oo) (-1)^(n) x^( n+1)=

Find the value of sum_(i=1)^n sum_(i=1)^n sum_(k=1)^n 1

Find the value of sum_(i=1)^n sum_(i=1)^n sum_(k=1)^n k

If n in N, sum_(k=1)^(n)sin^(-1(x_(k))=(npi)/2 then the value of sum_(k=1)^(n)x_(k)=

AAKASH SERIES-STATISTICS -EXERCISE-5.2
  1. Find the variance for the discrete data given below . (i) 6,7,10,12,...

    Text Solution

    |

  2. Find the variance for the discrete data given below. 350, 361, 370, ...

    Text Solution

    |

  3. Find the variance and standard deviation of the following data 5,12 ,...

    Text Solution

    |

  4. If standard deviation of 1, 2, 3, 4, ...,10 is sigma then, show that s...

    Text Solution

    |

  5. If n=10 , sum(i=1)^(10) x(i)=60 and sum(i=1)^(10) x(i)^(2)=1000 then f...

    Text Solution

    |

  6. Calculate the variance and standard deviation of the following continu...

    Text Solution

    |

  7. Calculate the variance and standard deviation of the following continu...

    Text Solution

    |

  8. If the s.d of-5, -4,-3, -2,-1, 0, 1, 2, 3, 4, 5 is sqrt(10) then find ...

    Text Solution

    |

  9. If a variable takes the values 0, 1, 2,…,n with frequencies proporiotn...

    Text Solution

    |

  10. Suppose a population A has 100 observations 101, 102, ...., 200, and a...

    Text Solution

    |

  11. In a series of 2n observations, half of them equals to a and remaining...

    Text Solution

    |

  12. The standard deviations of two sets containing 10 and 20 members are 2...

    Text Solution

    |

  13. If sum(i=1)^(18)(x(i)-8)=9 and sum(i=1)^(18)(x(i)-8)^(2)=45 then find ...

    Text Solution

    |

  14. The mean and standard deviation of 20 items is found to be 10 and 2 re...

    Text Solution

    |

  15. For two data sets each of size 5 the variances are given by 4 and 5 an...

    Text Solution

    |

  16. The means and variance of n observation x1, x2, x3,....xn are 5 and 0 ...

    Text Solution

    |

  17. The standard deviation of n observation x1 , x2, x3 .....,xn is 2. If...

    Text Solution

    |

  18. The mean and standard deviation of 100 observations were calculated as...

    Text Solution

    |