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} \\ =(-2+1+3)/(3)=(2)/(3) \end{gathered}`

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