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Ram Gopal Bail
Asked: 2022-11-02T21:21:07+05:30 In:

If the mean of the observation x, x+3, x+5, x+7 and x+10 is 9, then mean of the last three observations is
A. `10(1)/(3)`
B. `10(2)/(3)`
C. `11(1)/(3)`
D. `11(2)/(3)`

If the mean of the observation x, x+3, x+5, x+7 and x+10 is 9, then mean of the last three observations is
A. `10(1)/(3)`
B. `10(2)/(3)`
C. `11(1)/(3)`
D. `11(2)/(3)`
Parabola
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1 Answer

  1. Mean = 9
    `rArr (x+x+3+x+5+x+7+x+10)/(5) = 9`
    `rArr 5x+25 = 45`
    `rArr x = 4`
    Last three observations are 4+5, 4+7, 4+10 i.e., 9,11,14
    ` “Mean”= (9+11+14)/(3) = (34)/(3) = 11(1)/(3)`
    Hence, (c) is the correct answer.

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