CUET · MATHS · PYQ PAPER 2025
The values of ' \(a\) ' and ' \(b\) ' if the equation of straight line trend by least square method is given by \(y=a+b x\) such that \(\sum x=0, \sum y=84, \sum x y=108, \sum x^2=70\) for 6 observation as are :
- A \(a=0 ; b=1.28\)
- B \(a=14 ; b=1.54\)
- C \(a=11.6 ; b=0\)
- D \(a=14 ; b=1.28\)
Answer & Solution
Correct Answer
(B) \(a=14 ; b=1.54\)
Step-by-step Solution
Detailed explanation
\(a = \frac{\sum y}{n}\) \(a = \frac{84}{6}\) \(a = 14\) \(b = \frac{\sum xy}{\sum x^2}\) \(b = \frac{108}{70}\) \(b \approx 1.54\)
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