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【简答题】
高三某班学生每周用于数学学习的时间x（单位：小时）与数学成绩y（单位：分）之间有如下数据： x 24 15 23 19 16 11 20 16 17 13 y 92 79 97 89 64 47 83 68 71 59 根据统计资料，该班学生每周用于数学学习的时间的中位数是______； 根据上表可得回归方程的斜率为3.53，截距为13.5，若某同学每周用于数学学习的时间为18 小时，则可预测该生数学成绩是______分（结果保留整数）．
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【PrintScreen】
B.
【Shift】+【PrintScreen】
C.
【Ctrl】+【PrintScreen】
D.
【Alt】+【PrintScreen】
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