What is the sum of the whole number from 1 to 2000

You are constructing a histogram for scores that range from 70 to 100 in whole points. frequencies range from 3 to 10; that is, every whole-point score between 60 and 100 occurs at least 3 times, and at least one score occurs 10 times. which of these would probably be the best range and size for the score intervals along the x-axis?

When only separate discreet points are graphed it is called?

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68