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The mean weight of 9 items is 15. If one...

The mean weight of 9 items is 15. If one more item is added to the series the mean becomes 16. The value of 10th item is (a) `35` (b) `30` (c) `25` (d) `20`

A

`35`

B

`30`

C

`25`

D

`20`

Text Solution

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The correct Answer is:
C
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MCGROW HILL PUBLICATION-STATISTICS -EXERCISE (LEVEL-1 ( SINGLE CORRECT ANSWER TYPE QUESTIONS))
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  3. The arithmetic mean of the squares of the first n natural numbers is

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  4. The arithmetic mean of the series 1,2,2^(2) ,…….2^(n-1) is

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  5. The arithmetic mean of the series ""^(n) C0 , ""^(n) C1, ""^(n) C2….,"...

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  6. The mean of the series a, a + d, a + 2d, …, a + 2 nd, is

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  7. {:("Variate (x) ", 0, 1, 2, 3, ... , n ),("Frequency (f)", "...

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  10. The mean weight of 9 items is 15. If one more item is added to the ser...

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  11. For a certain frequency table which has been partly reproduced here ,...

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  13. The median from the following date : {:("Mid-value","Frequency","Mi...

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  14. In a discrete series , the relation between s.d.s and range r is

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  15. if A.M.,G.M. and H.M. in series are equal then

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  16. For a group containing 100 observations, the arithmetic mean and stand...

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  17. A sample of 90 values has mean 55 and standard deviation 3. A second s...

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