The average of 11 numbers is 10/9. If the average of the first six numbers is 10.5 and that of the last six numbers is 11.4, then the middle number is :
Options:
A . 11
B . 11.3
C . 11.4
D . 11.5
Answer: Option D
Middle number = [(10.5 x 6 + 11.4 x 6 ) - 10.9 x 11] = 131.4 - 119.9 = 11.5.
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