A nationwide test taken by high school sophomores and juniors has three sections, each scored on a scale of20 to80. In a recent year, the national mean score for the writing section was50.5, with a standard deviation of10.7. Based on this 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 least89 (about89%) of the scores lie between ____and____. (Round your answer to 1 decimal place.)

(b)According to Chebyshev's theorem, at least (Choose one) of the scores lie between29.1 and71.9.