21)If the random variable, x, is normally distributed, percent of all possible observed values of x will be within two standard deviations of the mean.

is there supposed to be a diagram or a graph for this one? ?

step-by-step explanation:

here's a poem i finished a while ago. i hope you like it and that it inspires you.

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.