For Reeta :
And,
\(σ=\sqrt{\frac{\displaystyle\sum tx_i^2}{n}-(\frac{\displaystyle\sum x_i}{n})^2}\)
\(=\sqrt{\frac{21,139}{10}-(\frac{441}{10})^2}\)
\(=\sqrt\frac{2,11,930-1,94,481}{100}\)
\(=\sqrt{169.09}\)
= 13(approx.)
For Seeta:
Since co-effecient for Seeta is more than that of Reeta, so Seeta is more variable and hence Reeta is more consistent. And Seeta is more intelligent.
