Normal Dist for 2 variable statistics on WP 34S

[lrdheat]

I enter an X value, then a y value, and hit the summation key, and do so for my list of X and y values. If I then execute X-bar (mean X), X-bar AND y-bar are placed in the X and y display lines. If I enter some number into the command line, go to the probability menu, go to normal distribution choices, I can get an immediate calculation of cumulative probability and other normal distribution calculations for the X values that were entered by the summation key. I'm wondering how to switch things so that the normal distribution calculations can be done on the y values that were entered with the summation key.