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If the standard deviation of the numbers...

If the standard deviation of the numbers 2, 3, a and 11 is 3.5. Then which of the following is true ?

A

`3a^(2)-26a+55=0`

B

`3a^(2)-32a+84=0`

C

`3a^(2)-34a+91=0`

D

`3a^(2)-23a+44=0`

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Knowledge Check

  • In a triangle, a=2b and A=3B. Mention which of the following is true?

    A
    The triangle is equilateral
    B
    The triangle is isosceles
    C
    The triangle is right angled
    D
    The existence of such a triangle is not possible.

  • The Standard Deviation of scores 1, 2, 3, 4, 5 is

    A
    `(2)/(5)`
    B
    `(3)/(5)`
    C
    `sqrt2`
    D
    `sqrt3`

  • The mean deviation of the numbers 3,4,5,6,7 from the mean is -

    A
    25
    B
    5
    C
    1.2
    D
    0

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