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For two observations, the sum is S and p...

For two observations, the sum is S and product is P. What is the harmonic mean of these two observations?

A

`(2S)/( P )`

B

`( S )/(( 2P))`

C

`( 2P )/( S)`

D

`(P )/( (2S))`

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Knowledge Check

  • The geometric mean and harmonic mean of two non negative observations are 10 and 8 res[ectovely. Then what is the arithmetic mean of the observations equal to?

    A
    4
    B
    9
    C
    12,5
    D
    2

  • The mean of 7 observation is 10 and that of 3 observations is 5. What is the mean of all the 10 observations?

    A
    15
    B
    10
    C
    8.5
    D
    7.5

  • If the three observations are 3, -6 and -6, then what is their harmonic mean?

    A
    0
    B
    `oo`
    C
    `-1//2`
    D
    `-3`

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