## Elementary Statistics (12th Edition)

We know the following equation for z-scores: $z=\frac{x−μ}{σ}$ Thus, after finding the standard deviation and average using a calculator, we use this equation to see that the coordinates (x,z) are: (134,−0.52);(139,0);(131,−1.28);(143,0.52);(145,1.28) After we use this to create the normal quantile plot, we can see if the data are in a straight line. In this case, the data are in a straight line, hence we can see that the distribution is normal.