Home
Class 12
MATHS
If overline X is the mean of a distribut...

If `overline X` is the mean of a distribution of `X,` then under usual notation sum `sum_(i=1)^n f_i (x_2-overlinex)` is

A

MD

B

SD

C

0

D

relative frequency

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • GGSIPU MATHMATICS 2011

    IPUCET PREVIOUS YEAR PAPERS|Exercise MCQ|46 Videos

  • GGSIPU MATHMATICS 2013

    IPUCET PREVIOUS YEAR PAPERS|Exercise MCQs|41 Videos

Similar Questions

Explore conceptually related problems

If bar(X) is the mean of a distribution of X, then under usual notation sum sum_(i=1)^(n)f_(i)(x_(2)-bar(x)) is

sum_(i=1)^(n) sum_(i=1)^(n) i is equal to

If barx=1/n sum_(i=1)^n x_i then prove that sum_(i=1)^n (x_i-barx)=0

The average vecx and stanard deviation delta=sqrt(1/N sum_i f_i(x_i-overlinex)^2,) where sum_i=N is the total number of students, f_i is the number of students having marks x_i and sum_i stand for summation. In an examination of 100 students for a 50-marks paper, the maximum score obtained was 44. Each students was awarded 6 additional marks and the resulting marks were scaled up to a total of 100 marks for the paper, Then

The standard deviation (sigma) of variate x is the square root of the A.M. of the squares of all deviations of x from the A.M. observations. If x_i//f_i , i=1,2,… n is a frequency distribution then sigma=sqrt(1/N Sigma_(i=1)^(n) f_i(x_i-barx)^2), N=Sigma_(i=1)^(n) f_i and variance is the square of standard deviation. Coefficient of dispersion is sigma/x and coefficient of variation is sigma/x xx 100 For a given distribution of marks mean is 35.16 and its standard deviation is 19.76 then coefficient of variation is

IPUCET PREVIOUS YEAR PAPERS-GGSIPU MATHMATICS 2012-MCQs
  1. The probability for arandomly chosen month to have its 10^(th) day as ...

    Text Solution

    |

  2. If the mean of the numbers 27+x, 31+x, 89+x, 107+x, 156+x is 82, then ...

    Text Solution

    |

  3. If overline X is the mean of a distribution of X, then under usual not...

    Text Solution

    |

  4. Two cards are drawn successively with replacement from a well-shuffled...

    Text Solution

    |

  5. If sec((x+y)/(x-y))=a , prove that (dy)/(dx)=y/x .

    Text Solution

    |

  6. If x^(y)=e^(x-y), then (dy)/(dx) is equal to

    Text Solution

    |

  7. For y= cos(m sin^(-1)x), which of the following is true?

    Text Solution

    |

  8. If f (x) = {{:(x + 1 , x le 1), (3 - ax^(2) ,x gt 1):} is continuous ...

    Text Solution

    |

  9. underset(x to (pi)/(2))(lim)(a^(cot x) -a^(cosx))/(cot x- cot x ) is ...

    Text Solution

    |

  10. If f''(0)=k,kne0, then the value of lim(xto0)(2f(x)-3f(2x)+f(4x))/(x^...

    Text Solution

    |

  11. If g is the inversefunction of f and f’ (x ) = (1)/( 1 + x^(n)) then ...

    Text Solution

    |

  12. The curves 4x^2+9y^2=72 and x^2-y^2=5a t(3,2) touch each other (b)...

    Text Solution

    |

  13. The velocity in m/s of a particle is proportional to the cube of the t...

    Text Solution

    |

  14. The minimum value of x\ (log)e x is equal to e (b) 1//e (c) -1//e (d) ...

    Text Solution

    |

  15. A particle moves along the x-axis so that its position is given x = 2t...

    Text Solution

    |

  16. A stone thrown vertically upwards satisfies the equations s = 80t –16t...

    Text Solution

    |

  17. If f (x+ y) = f(x) , f(y) , f(3) = 3 , f'(0) = 11 . Then f'(3) is equa...

    Text Solution

    |

  18. If y = x tan y , then (dy)/(dx) is equal to

    Text Solution

    |

  19. The product of the lengths ofsubtangent and subnormal at any point x,y...

    Text Solution

    |

  20. The equation to the tangent to (x/a)^n + (y/b)^n = 2 at (a,b)

    Text Solution

    |