题目列表(包括答案和解析)
52. 解:(1)略 ·········································································································· 3分
(2)略············································································································· 5分
(3)(人)······································································· 6分
的频率为,大于A、C、D的频率,故这名学生评为B等的可能性最大. 8分
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
50.
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
47. 解:(1)样本容量为 50 ,m= 10 ,中位数是 28分 ;
(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.
46. 解:
(1)如图1
(2)80-100
(3)840
45. 提示:⑴500,20%,12%;⑵略;⑶11900;
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)
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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