题目列表(包括答案和解析)

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52. 解:(1)略 ·········································································································· 3分

    (2)略············································································································· 5分

    (3)(人)······································································· 6分

      的频率为,大于ACD的频率,故这名学生评为B等的可能性最大.    8分

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51. (1)在扇形统计图的空白处填上“D  22%”························································ 3分

(2)6月1日在该超市购物的总人次为1250(人次)··················································· 6分

6月1日自带购物袋的有225人次·················································································· 8分

(3)答案不唯一,如“自带购物袋的人增多”

“租借购物篮的人减少”等························································································· 10分

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49. (1)A型销售量平均数14;B型销售量中位数15;A型销售量方差4.3………………3分

(2)

                              ………………5分

建议如下:从折线图来看,B型冰箱的月销售量呈上升趋势,若考虑增长势头,进货时可多进B型冰箱. ………………………………  ………………………………7分

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47. 解:(1)样本容量为  50  ,m=  10  ,中位数是  28 

(2)样本的体育成绩优秀率为60%,500×60%=300(人)

∴估计该校九年级体育成绩达到优秀的总人数为300人.

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46. 解:

(1)如图1

(2)80-100

 (3)840

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45. 提示:⑴500,20%,12%;⑵略;⑶11900;

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44. 解: (1)C品牌.(不带单位不扣分)        

     (2)略.(B品牌的销售量是800个,柱状图上没有标数字不扣分) 

     (3)60°.(不带单位不扣分)          

        (4)略.(合理的解释都给分)         

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43. 解:(1)90;补充后的图如下(每项1分,计2分)

 

(2)A:

B:

   C:

(方法对1分,计算结果全部正确1分,计2分)

(3)A:(分)

B:(分)

C:(分)

B当选

(方法对1分,计算结果全部正确1分,判断正确1分,计3分)

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