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The arithmetic mean of 11 observations is 11. The arithmetic mean of the first 6 observations is 10-5 and the arithmetic mean of the last 6 observations is 11.5. What is the sixth observation?
10.0
10.5
11.0
11.5
Sum of 11 observation = 11*11 = 121
Sum of first 6 observation = 10.5*6 = 63
Sum of last 6 observation = 11.5 *6 = 69
Sum of first 6 & last 6 observations = 63 + 69 = 132 Thus, Sixth observation = 132-121 = 11
By: Munesh Kumari ProfileResourcesReport error
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