Q73.The sum of 100 observations and the sum of their squares are 400 & 2475, respectively. Later on, three observations 3, 4 & 5 were found to be incorrect. If the incorrect observations are omitted, then the variance of the remaining observations is (1) 8. 25 (2) 8. 50 (3) 9. 00 (4) 8. 00
What This Question Tests
This question requires recalculating the sum of observations and sum of squares after removing incorrect data points, and then determining the new variance.
Concepts Tested
Formulas Used
Mean (x̄) = Σx/n
Variance (σ²) = (Σx²/n) - (x̄)²
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📋 Question Details
- Chapter
- Statistics
- Topic
- Variance, Mean
- Year
- 2017
- Shift
- 09 Apr Online
- Q Number
- Q73
- Type
- MCQ
- NCERT Ref
- Class 11 Mathematics Ch 15: Statistics
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