Home
Class 12
MATHS
For a data consisting of 15 observations...

For a data consisting of 15 observations `x_(i), i=1,2,3,…,15` the following results are obtained :`sum_(i=1)^(15) x_(i)= 170, sum_(i=1)^(15) x_(i)^(2) = 2830.` If one of the observation namely 20 was found wrong and was replaced by its correct value 30, then the corrected variance is

A

80

B

78

C

76

D

75

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • AP EAMCET SOLVED PAPER 2018 ( 23-04-2019,SHIFT -1)

    TS EAMCET PREVIOUS YEAR PAPERS|Exercise Mathematics|39 Videos

  • AP EAMCET SOLVED PAPER 2019 (22-04-2019, SHIFT-2)

    TS EAMCET PREVIOUS YEAR PAPERS|Exercise MATHEMATICS|77 Videos

Similar Questions

Explore conceptually related problems

In a data with 15 number of observations x_(1), x_(2), x_(3), ..., x_(15), sum_(i=1)^(15) x_(i)^(2)=3600 and sum_(i=1)^(15) x_(i)=175 . If the value of one observation 20 was found wroung and was replaced by its correct value 40, them the correct variance of that data is

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

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

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

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

If sum_(i=1)^(18)(x_(i)-8)=9 and sum_(i=1)^(18)(x_(i)-8)^(2)=45 then find the standard deviation of x_1 , x_2, ....,x_(18)

TS EAMCET PREVIOUS YEAR PAPERS-AP EAMCET SOLVED PAPER 2019-MATHEMATICS
  1. The shortest distance between the skew lines r = (6hati + 2hatj + 2h...

    Text Solution

    |

  2. If a makes an acute angle with b,r cdota = 0 and r xx b = c xx b, then...

    Text Solution

    |

  3. For a data consisting of 15 observations x(i), i=1,2,3,…,15 the follow...

    Text Solution

    |

  4. A and B each select one number at random from the distinct numbers 1, ...

    Text Solution

    |

  5. There are 3 bags A , B and C. Bag A contains 2 white and 3 black balls...

    Text Solution

    |

  6. If a random variable X has the probability distrbution given by P(X = ...

    Text Solution

    |

  7. A box contains 30 toys of same size in which 10 toys are white and all...

    Text Solution

    |

  8. The locus of the point of intersection of the lines x sin theta+(1-cos...

    Text Solution

    |

  9. A line L has intercepts a and b on the coordinate axes. When the axes ...

    Text Solution

    |

  10. If O is the origin and A and B are points on the line 3x - 4 y + 25 = ...

    Text Solution

    |

  11. If P(alpha, beta) be a point on the line 3x + y = 0 such that the poi...

    Text Solution

    |

  12. Two vertices of a triangle are (5,-1) and (-2,3). If the orthocentre ...

    Text Solution

    |

  13. The distance from the origin to the orthocentre of the triangle fromed...

    Text Solution

    |

  14. The combined equation of two lines L and L(1) is 2x^(2) + axy + 3y^(2)...

    Text Solution

    |

  15. The power of the point B(-1,1) with respect to the circle S equiv x^(2...

    Text Solution

    |

  16. If tangents are drawn to the circle x^(2) + y^(2) = 12 at the points w...

    Text Solution

    |

  17. If the point of intersection of the pair of the transverse common tang...

    Text Solution

    |

  18. If the circles x^(2) + y^(2) + 2lambda x + 2 =0 and x^(2) + y^(2) ...

    Text Solution

    |

  19. The equation of the circle whose diameter is the common chord of the c...

    Text Solution

    |

  20. If the forcus of a parabola divides a focal chord of the parabola into...

    Text Solution

    |