How can I solve this

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?

Need on this one asap im almost done with this subject

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents