(6分)某區(qū)為了解全區(qū)2800名九年級學(xué)生英語口語考試成績的情況,從中隨機抽取了部分學(xué)生的成績(滿分24分,得分均為整數(shù)),制成下表:
分數(shù)段(x分) | x≤16 | 17≤x≤18 | 19≤x≤20 | 21≤x≤22 | 23≤x≤24 |
人 數(shù) | 10 | 15 | 35 | 112 | 128 |
【小題1】(1)①300················································································· 1分
②21≤x≤22···················································································· 3分
③12······························································································ 4分
【小題2】2)2800×=2240(人) 5分
解析
科目:初中數(shù)學(xué) 來源: 題型:解答題
成績x(分) | 頻數(shù) | 頻率 |
50≤x<60 | 10 | ______ |
60≤x<70 | 16 | 0.08 |
70≤x<80 | ______ | 0.2 |
80≤x<90 | 62 | ______ |
90≤x<100 | 72 | 0.36 |
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科目:初中數(shù)學(xué) 來源:2013年內(nèi)蒙古呼和浩特市中考數(shù)學(xué)試卷(解析版) 題型:解答題
成績x(分) | 頻數(shù) | 頻率 |
50≤x<60 | 10 | ______ |
60≤x<70 | 16 | 0.08 |
70≤x<80 | ______ | 0.2 |
80≤x<90 | 62 | ______ |
90≤x<100 | 72 | 0.36 |
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