### Box-and-whisker analysis

Question Sample Titled 'Box-and-whisker analysis'

The box-and-whisker diagram below shows the distribution of the score deduction by mistakes received by a group of students of a class in a Mathematics exam:

${21.7}$${35.4}$${29.4}$${24.3}$${b}$Score deduction($\text{mark}$)

 The inter-quartile range of the distribution is ${7.7}$ $\text{marks}$ . (a) Find ${b}$ . (b) The students join a remedial class. It is found that the highest score deduction by mistakes received by the students in a Mathematics exam after the remedial class is ${4.7}$ $\text{marks}$ less than that before the remedial class. The manager of the remedial class claims that at least 25% of the students show improvement in the score deduction by mistakes received in a Mathematics exam after the remedial class. Do you agree? Explain your answer.  (3 marks)

 (a) ${b}$ $={24.3}+{7.7}$  $={32}$ 1A (b) The highest score deduction by mistakes received by the students in a Mathematics exam after the remedial class   $={35.4}-{4.7}$  $={30.7}$ which is less than the upper quartile of the distribution of the score deduction by mistakes received before the remedial class. 1M Thus, the claim is agreed. 1A

# 專業備試計劃

DSE Preparation Plan

Level 4+ 保證及 5** 獎賞

### 常見問題

ePractice 是甚麼？

ePractice 是一個專為中四至中六而設的應用程式，旨為協助學生高效地預備 DSE 數學（必修部分）考試。ePractice 是網站應用程式，因此無論使用任何裝置、平台，都可以在瀏覽器開啟使用。更多詳情請到簡介頁面。

### 簡介

ePractice 可以取代傳統補習嗎？

ePractice 是甚麼？

ePractice 是一個專為中四至中六而設的應用程式，旨為協助學生高效地預備 DSE 數學（必修部分）考試。ePractice 是網站應用程式，因此無論使用任何裝置、平台，都可以在瀏覽器開啟使用。更多詳情請到簡介頁面。

### 帳戶

「體驗帳戶」可以使用多久？

「體驗帳戶」不會過期，但用戶只能做 30 條題目，而且觀看少部分的知識內容。如希望無限量使用 ePractice 的所有練習服務及內容，請成為我們的會員！

### 有關繳款

ePractice 提供對所有會員服務購買的 14 天無條件退款保證（恕不適用於服務期少於兩個月的計劃）。請聯絡我們並提供相關訂單編號以進行退款。如您透過信用卡付款，款項將退回至您的信用卡。如使用其他付款方式，請提供您的銀行帳號、FPS ID 或 PayMe ID 以便進行退款轉帳。

Initiating...

HKDSE 數學試題練習平台