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A group of 10 items has arithmetic mean ...

A group of 10 items has arithmetic mean 6. If the arithmetic mean of 4 of these items is 7.5, then the mean of the remaining items is

A

`6*5`

B

`5*5`

C

5

D

`4*5`

Text Solution

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The correct Answer is:
C
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ML KHANNA-MEASURES OF CENTRAL TENDENCY -Problem Set (1) (Measures of Central Tendency)
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  6. The weighted mean of first n natural numbers whose weights are equal t...

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  7. The arithmetic mean of n numbers of a series is bar(x). The sum of the...

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  8. If a variate takes values a, ar,ar^(2),..ar^(n-1) which of the relatio...

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  9. A population of values is symmetrically distributed about the constant...

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  10. The geometric mean of the series 1,2,4,8,16,....,2^n is

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  11. An aeroplane flies round a square, the sides of which measure 100 mile...

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  12. A group of 10 items has arithmetic mean 6. If the arithmetic mean of 4...

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  14. The numbers 3,5,7,4 have frequencies x,x+4,x-3,x+8. If their arithmeti...

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  15. If the mean of a set of observations x(1),x(2), …,x(n)" is " bar(X), t...

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  16. If the mode and mean of a moderately asymmetrical series are 16 inche...

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  17. The results of two colleges are as follows : then

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  18. If g(1) and g(2) be the geometric means of two series of n(1) and n(2)...

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  19. For a symmetrical distribution lower quartile is 20 and upper quartile...

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  20. For a symmetrical distribution P(25) and P(75) are 30 and 70 respectiv...

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