Question

Find the standard deviation of x for the given points: {(-2,-1), (1,1), (3,2)}.Round your solution to three decinal places.

Answer 1

The x coordinates of the points are -2, 1 and 3

To find standard deviation, take the average or mean of thegiven numbers.

$\begin{gathered} \text{Let n be the total count of numbers} \\ Mean,x_i=\frac{\text{Sum of numbers}}{n} \\ =\frac{-2+1+3}{3}=\frac{2}{3} \end{gathered}$

Now subtract the mean from eah number and take their squares.

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