X P(X) 10 0. 2
20 0. 35
30 0. 28
40 0. 17

Find the mean of the above probability distribution. You must show how to calculate this for full credit. Find the standard deviation of the above probability distribution. You must show how to calculate this for full credit.

Aflagpole broke in a storm. it was originally 8 1 81 feet tall. 2 8 28 feet are still sticking straight out of the ground, where it snapped, but the remaining piece has hinged over and touches the ground some distance away. how far away is the end of the pole from the base of the pole along the ground?