题目
The heights, in cm, of the 15 rugby players in each of two teams, the Hippos and the Zebras, are shown in the following table.
| Hippos | 165 | 168 | 172 | 172 | 176 | 178 | 181 | 184 | 185 | 188 | 188 | 190 | 191 | 192 | 195 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zebras | 183 | 192 | 172 | 167 | 184 | 189 | 171 | 194 | 191 | 179 | 186 | 182 | 177 | 175 | 186 |
(a) Draw a back-to-back stem-and-leaf diagram to represent this information, with Hippos on the left-hand side.
(b) Find the interquartile range of the heights of the players in the Hippos team.
The player in the Hippos with height is injured. A new player replaces him, and this causes the mean height of the 15 players in the team to increase by .
(c) Find the height of the new player.
题目中文翻译
Hippos 和 Zebras 两支橄榄球队各有 15 名球员,他们的身高如下表所示,单位为厘米。
| Hippos | 165 | 168 | 172 | 172 | 176 | 178 | 181 | 184 | 185 | 188 | 188 | 190 | 191 | 192 | 195 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zebras | 183 | 192 | 172 | 167 | 184 | 189 | 171 | 194 | 191 | 179 | 186 | 182 | 177 | 175 | 186 |
(a) 画出背靠背茎叶图表示这些数据,将 Hippos 放在左侧。
(b) 求 Hippos 队球员身高的四分位距。
Hippos 队中身高为 的球员受伤。一名新球员替换了他,使全队 15 名球员的平均身高增加了 。
(c) 求新球员的身高。
原卷通用作答要求
Answer all questions. You should use a calculator where appropriate.
You must show all necessary working clearly; no marks will be given for unsupported answers from a calculator.
Give non-exact numerical answers correct to 3 significant figures, or 1 decimal place for angles in degrees, unless a different level of accuracy is specified in the question.
请回答所有题目。适当时应使用计算器。必须清楚展示所有必要的计算过程;仅给出计算器答案而没有过程,不予评分。除非题目另有精度要求,非精确数值答案保留 3 位有效数字,以度为单位的角度保留 1 位小数。
解答
(a)
解法一
思路
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将前两位作茎,个位作叶。Hippos放左侧并由茎向外递增,Zebras放右侧;保留所有重复值,并加上带队名和单位的非对称图例。
答题过程
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Use the first two digits as stems and the final digit as each leaf, with Hippos on the left.
Key: represents for Hippos and for Zebras.
(b)
解法一
思路
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15个数据的中位数在第8位。下、上四分位数分别是去掉中位数后的两组中位数,即原有序数据的第4及第12位。
答题过程
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The Hippos data are already in ascending order. The lower quartile is the 4th value, , and the upper quartile is the 12th value, . Hence
(c)
解法一
思路
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人数保持15人,均值增加0.5,说明总身高增加7.5厘米。只有被替换的球员改变,因此新球员比原球员高7.5厘米。
答题过程
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The increase in the total height is
Only one player has changed, so the new player’s height is