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The arithmetic mean of the scores of ...

The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% a mean score of 31. The mean score of remaining 55% is (a) 45 (b) 50 (c) 51.4 approx. (d) 54.6 approx.

A

0.546

B

0.45

C

0.5

D

0.514

Text Solution

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The correct Answer is:
D
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ARIHANT SSC-AVERAGE -EXERCISE HIGHER SKILL LEVEL QUESTION
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  2. The average age of 4 members of a family is 20 yr . If youngest member...

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  3. The arithmetic mean of the scores of a group of students in a test ...

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  5. The average weight of 4 men A, B, C and D is 67 kg. Another man E joi...

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  6. 3yr ago, the average age of family of 5 members was 17yr . Even after ...

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  7. The average age of three boys is 15yr . If the ratio of their ages is ...

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  8. 5 yr ago, the average age of Rashmi and Surbhi was 20 yr. Now, the ave...

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  9. The average weight of 60 students in a class was calculated to be 40 k...

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  10. A person bought some oranges worth Rs36 from each of the five markets ...

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  11. Average of a,b and c is 11 ,average of c ,d and e is 17 , average of e...

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  12. The average age of 54 girls in a class was calculated as 14 yr. It was...

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  13. The average age of a man and his two twin sons born on the same day is...

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  14. The ratio of pens and pencils in a stationary shop is 3 : 2, respectiv...

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  15. If the average of the ages of Rakesh and Mohan is 15, average of the a...

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  16. A cricketer has certain average for 10 innings . In the eleventh ,he s...

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  17. A cricketer whose bowling average is 12.4 runs per wicket, takes 5 wic...

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  18. Nine friends have a dinner in a hotel. Eight of them spent X 12 each o...

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  19. The average weight of the students in four sections A , B ,C and D is ...

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  20. The average age of students of aclass is 15.8yr. The average age of bo...

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