Sketch the two specified normal curves on the same set of axes
A normal curve with you = 20 and o = 3 and a normal curve with you = 30 and o = 3

You are probably aware that the center of the "bell curve" is at the value of \mu, and the width of the bell curve is related to \sigma . The formula for the normal distribution function is:


f(x) = \frac 1 {\sqrt{2 \pi \sigma ^2}} e^ {-\frac {(x- \mu)^2} {2 \sigma^2}}


I suggest that you plot a few values around the value of \mu , going out to \pm 3 \sigma in either direction, and see how it looks. Because the value of \sigma is the same for both curves, the two curves should look the same except shifted so that one is centered at x = 20 and the other at x = 30.