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The sum of ( x+ 5 ) observations is ( x...

The sum of `( x+ 5 ) ` observations is `( x^(3) + 125)` . Find the mean of the observations.

Text Solution

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The correct Answer is:
`x^(2) - 5x + 25 `
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Knowledge Check

  • If the mean of five observations x, x+2 , x+4 , x+6 , x+8 , is 11 , then the mean of first three observations is

    A
    9
    B
    11
    C
    13
    D
    15

  • The random error in the arithmetic mean of 50 observations is 'a', then the random error in the arithmetic mean of 200 observations would be ............

    A
    ` 4a `
    B
    `16a^(2)`
    C
    `a/4`
    D
    `a/2`

  • If the means of five observation x, x + 2, x + 4, x + 6, x + 8, is 11 then the mean of first three observation is

    A
    9
    B
    11
    C
    13
    D
    15

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    The mean of five observations is 4 and their variance is 5.2. If three of these observations are 1,2 and 6, then the other two are

    The mean of the data set comprising of 16 observations is 16. If one of the observation valued 16 is deleted and three new observations valued 3, 4 and 5 are added to the data, then the mean of the resultant data, is : (1) 16.8 (2) 16.0 (3) 15.8 (4) 14.0

    The variance of 20 observations is 5. If each observation is multiplied by 2, find the new variance of the resulting observations.

    The mean of five observations is 5 and their variance is 9.20. If three of the given five observations are 1,3 and 8, then a ratio of other two observations is

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