问题
解答题
（6分）某区为了解全区2800名九年级学生英语口语考试成绩的情况，从中随机抽取了部分学生的成绩（满分24分，得分均为整数），制成下表：
①本次抽样调查共抽取了 ▲ 名学生； ②学生成绩的中位数落在 ▲ 分数段； ③若用扇形统计图表示统计结果，则分数段为x≤16的人数所对应扇形的圆心角为 ▲ °； 小题2:（2）如果将21分以上（含21分）定为优秀，请估计该区九年级考生成绩为优秀的人数． |
答案
小题1:（1）①300················································································· 1分
②21≤x≤22···················································································· 3分
③12······························································································ 4分
小题2:2）2800×=2240（人） 5分