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प्रश्न
The mean of 9 observations is 32. It was found that one observation 36 was misread as 63. Find the mean if:
- this observation is excluded.
- correct observation is included.
योग
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उत्तर
Given: Mean of 9 observations = 32.
One observation was misread: actual = 36, recorded = 63.
Total with the recorded/misread data = 9 × 32 = 288.
a. If the (misread) observation is excluded:
Sum of remaining 8 observations
= 288 – 63
= 225
New mean
= 225 ÷ 8
= 28.125
= `28 1/8`
b. If the correct observation (36) is included (i.e., replace 63 by 36):
Correct total
= 288 – 63 + 36
= 261
Correct mean
= 261 ÷ 9
= 29
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Notes
The answer in the textbook is incorrect.
क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
