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What is another way name for bd? cf, bd, cf, be

Consider the image seen here. the image, at point y, represents the process of during which a is being produced.

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)?