One number is 5 less than another. the sum of the two numbers is 181. find the two numbers.

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?

How can you check that you have correctly converted frequencies to relative frequencies?

Why is causation so much more difficult to prove than correlation?