The arithmetic mean of 11 observations is 11. The

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The arithmetic mean of 11 observations is 11. The arithmetic mean of the first 6 observ9.tions is 10-5 and the arithmetic mean of the last 6 observations is 11.5. What is the sixth observation?

[CDS-I 2018 Elementary Maths(PYSP)]

A 10.0

B 10.5

C 11.0

D 11.5