CUET · MATHS · PYQ PAPER 2025
Which of the following are normal equations to fit a straight line trend \(y=a+b x\) by the method of least squares?
- A \(\sum y=a \sum x+b \sum x^2, \quad \sum x y=a \sum x+b \sum y^2\)
- B \(\sum y=n a+b \sum x, \quad \sum x y=a \sum x+b \sum x^2\)
- C \(\sum x y=n a+b \sum x, \quad \sum x y=n a+b \sum x^2\)
- D \(\sum x=n a+b \sum y^2, \quad \sum y=a \sum x+b \sum y^2\)
Answer & Solution
Correct Answer
(B) \(\sum y=n a+b \sum x, \quad \sum x y=a \sum x+b \sum x^2\)
Step-by-step Solution
Detailed explanation
The normal equations are: \(\sum y=n a+b \sum x\) \(\sum x y=a \sum x+b \sum x^2\)
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