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A group of 10 items has mean 6 If the me...

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

A

6.5

B

5.5

C

4.5

D

5

Text Solution

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The correct Answer is:
D
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PATHFINDER-STATISTICS AND MATHEMATICAL REASONING-QUESTION BANK
  1. The mean of 50 observations is 36. If two observations 30 and 42 are d...

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  2. the weighted mean of first n natural numbers whose weights are equal ...

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  3. A group of 10 items has mean 6 If the mean of 4 of these items is 7.5 ...

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  4. The mean of a set of observations is overlinex If observations is div...

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  5. The geometric mean of the first n terms of the G.P. a,ar,ar^2,….is

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  6. The geometric mean of the observations 2, 4, 8, 16, 32, 64, is

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  7. A boy goes to school from him home at a speed of x km/hr. and comes ba...

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  8. Ram spends equal amounts on purchasing three kinds of pens being sold ...

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  9. An automobile driver travels from plain to a hill station 120 km dista...

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  10. If a, b, c, are any three positive numbers , then the least value of (...

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  11. The median of the data 13, 14, 16, 18, 20, 22 is

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  12. For a continuous series the mode is computed by the formula

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  13. If mean = (3median - mode)x, then the value of x is

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  14. The mean deviation from median is

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  15. The mean deviation from the median is

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  16. If each observation of a rew data, whose variance is sigma^2 is multip...

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  17. The standard deviation of a variate x is sigma The standard deviation ...

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  18. If mean of 4,7,x,8 is 5 , then the value of x is.

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  19. The S.D of the first n natural numbers is

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  20. The mean and variance of a random variable X having a binomial distrib...

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