The mean marks obtained by 300 students in a subject are 60 The mean of top 100 students was found t...........

Quantitative Aptitude (CDS) Average

The mean marks obtained by 300 students in a subject are 60. The mean of top 100 students was found to be 80 and the mean of last 100 students was found to be 50. The mean marks of the remaining 100 students are

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Explanation:

As,
Mean of 300 numbers = 60
Sum of 300 numbers = 300 × 60 =18000
Sum of top 100 numbers + sum of last 100 numbers + sum of remaining numbers = 18000
Sum of remaining 100 numbers + 8000 + 5000 = 18000
Sum of remaining 100 numbers =18000 − 13000 = 5000
Mean of remaining 100 numbers =5000/100= 50