Sun	Mon	Tue	Wed	Thu	Fri	Sat
23	24	25	26	27	28	1
2	3	4	5	6	7	8
9	10	11	12	13	14	15
16	17	18	19	20	21	22
23	24	25	26	27	28	29
30	31	1	2	3	4	5

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Multiple Choice Questions

The arithmetic mean of the scores of a group of students in a test was 52 The brightest 20 of them s...........

Quantitative Aptitude(IBPS RRB CL) Average

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:

51.4

52.6

56.1

55.3

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Explanation:

Let the required mean score be a
Then, 20 x 80 + 25 x 31 + 55 x a = 52 x 100
1600 + 775 + 55a = 5200
55a = 2825
a = 51.4

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The arithmetic mean of the scores of a group of students in a test was 52 The brightest 20 of them s...........

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Explanation:

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