Laura has rectangular piece of wood that is 8 inches by 3 inches. She wants to cover the top of the piece of wood with strips of ribbon that are inch wide. What length of ribbon does she need to cover the top of the piece of wood?

On a test the graders have a mean of 77 and a standard deviation of 8. if we can approximate the distribution of these graders by a number distribution what percent of the students. a) scores higher than 77? b) should pass the test (grades > 60)? c) should fail the test (grades < 60)?