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DRDO Multi tasking staff Model paper 6
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© examsnet.com
Question : 83
Total: 100
The mean of 27 observations is 28. If the mean of the first 14 observations is 19 and that of the last 14 observations is 27, find the
14
th
observation.
-112
-98
-144
-133
Validate
Solution:
Sum of 27 observations = 27 × 28 = 756
Sum of first 14 observations = 14 × 19 = 266
Sum of last 14 observations = 14 × 27 = 378
14
th
observation = (266 + 378) - 756 = -112
∴
14
th
observation = -112
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