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प्रश्न
The mean of 10 observations is 72. It was found that two observations 65 and 85 were misread as 56 and 58. Find the correct mean.
बेरीज
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उत्तर
Given:
Number of observations = 10
Given mean = 72
Step-wise calculation:
1. Total ...(Given)
= Mean × Number
= 72 × 10
= 720
2. Sum of misread observations
= 56 + 58
= 114
3. Sum of correct observations
= 65 + 85
= 150
4. Corrected total
= 720 – 114 + 150
= 720 + 36
= 756
5. Correct mean
= Corrected total ÷ Number
= 756 ÷ 10
= 75.6
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