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Median of nine observations is 20.45 . I...

Median of nine observations is 20.45 . If 2 is added in last four observations, then new median is

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The correct Answer is:
Median will remain same .
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The mean of 10 observations is 28. If 2 is added to each observation and then each result is divided by 3, find the mean of new observations so obtained.

The mean of 20 observations is 45. If each observation is divided by 3, the new mean is 15

Knowledge Check

  • The mean of n observations is bar(x) . If the first observation is increased by 1, the second by 2 and so on, the new mean is . . . .

    A
    `bar(x) + n`
    B
    `bar(x) + (n)/(2)`
    C
    `bar(x) + (n + 1)/(2)`
    D
    `bar(x)`

  • The variance of 15 observations is 8. If each observation is multiplied by 4, then the variance of new observation is ……

    A
    32
    B
    24
    C
    8
    D
    128

  • The following data is for 15 observation obtained in an experiment. sumx_i^2 = 2830, sum x_i = 170 . The wrong observation is 20. If it is taken as 30, then the correct coefficient of variance is ………….

    A
    188.66
    B
    177.33
    C
    8.33
    D
    78

    • Similar Questions

    Explore conceptually related problems

    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 5 observations is 20. Including one new observation, the mean is 25. Find the newly included observation.

    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 5 observations is 4.4 and their variance is 8.24 . If three of the observations are 1,2 and 6, find the other two observations.

    Meidan of a data , arranged in ascending order 7,10,15,x,y,27,30 is 17 and when one more observation 50 is added to the data, the median has become 18 . Find x and y.

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