The plasma membrane will allow oxygen and carbon dioxide to pass through the membrane while other substances are blocked from passing through the membrane; its unique characteristic is described as.

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)?