The average marks obtained by 22 candidates in an examination is 50. The average of the first 10 candidates is 44, while that of the last eleven is 60. The marks obtained by the 11th candidate is


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Average of first 10 candidate = 44 ,
so x1 + x 2 ..... + x10 = 440

Last 11 candidates avg = 60
x12 + x13 + ...... + x22 = 660

(x1 + x2 +... + x10) + x11 + (x12 + x13 + ...... x22) = 1100
440 + x11 + 660 = 1100
so x11 = 0


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