Use the range rule of thumb to identify the values that are significantly​ low, the values that are signficantly​ high, and the values that are neither significantly low nor significantly high. A test is used to assess readiness for college. In a recent​ year, the mean test score was 19.7 and the standard deviation was 5.3. Identify the test scores that are significantly low or significantly high.
What test scores are significantly​ low? Select the correct answer below and fill in the answer​ box(es) to complete your choice.