STATISTICAL TECHNIQUES AND TOOLS
MEASURE OF ARITHMETIC MEAN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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THE ARITHMETIC MEAN OF OBSERVATIONS 9, 8, 27, 36 AND 45 IS ____
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18
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25
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36
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48
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Explanation:
Detailed explanation-1: -Mean of 9 observations = 45. So, Sum of 9 observations = 45 × 9 = 405. While computing mean, 42 was taken instead of 24. So, Correct sum of 9 observations = 405-42 + 24 = 387.
Detailed explanation-2: -The mean of 25 observations is 36. Out of these observations if the mean of first 13 observations is 32 and that of the last 13 observations is 40, the 13th observation is 36. Hence, the 13th observation is 36.
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