1.If ∑i=110(xi−15)=12\displaystyle\sum_{i=1}^{10}(x_i - 15) = 12i=1∑10(xi−15)=12 and ∑i=110(xi−15)2=18\displaystyle\sum_{i=1}^{10}(x_i - 15)^2 = 18i=1∑10(xi−15)2=18, then the S.D. of observations x1,x2,…,x10x_1, x_2, \ldots, x_{10}x1,x2,…,x10 is:a.25\dfrac{2}{5}52b.35\dfrac{3}{5}53c.45\dfrac{4}{5}54d.None of theseLogin to continueOnly logged in users canattempt or see the solution.
