A nationwide test taken by high school sophomores and juniors has 3 sections, each scored on a scale of 20 to 80. In a recent Year, the national mean score for the weighting sections was 49.9, with a standard deviation of 9.8. Based on the information, complete the following statements about the distribution of the scores on the writing section for the recent Year. (a). According to Chebyshev's Theorem, at least blank of the scores lie between 30.0 and 69.5. (b). According to Chebyshev's Theorem at least one blank of the scores lie between 20.5 and 79.3.