Write a program that find the average of list of numbers

Wich technology can a website use to allow you to listen to a concert live over the internet?

Ihave been given the number of guns per 100, and the total firearm-related deaths per 100,000. i have to find the actual number of guns per country and actual number of gun-related deaths. if somebody could show me how to do 1 question, i can finish the rest, i am just confused. tia

Three out of five seniors remain undecided about a college major at the end of their senior year.