Form 1 Mathematics Chapter 12

 Lesson requirement  Textbook 1B  Workbook 1B  Notebook  Before lessons start  Desks in good order!  No rubbish around!  No toilets!  Keep your folder at home  Prepare for Final Exam

 Ch. 5 OBQ:33  Ch. 5 CBQ:12, 20  Ch. 6 OBQ:33  Ch. 6 CBQ:12  Ch. 7 SHW(I):28 (redo)  Ch. 7 CBQ:6, 12, 20 (cor.), 28 (cor.)  Ch. 8 SHW(II):33  Ch. 8 OBQ:30  Ch. 8 CBQ:6, 20, 32, 33  Ch. 9 SHW(III):6, 33  Ch. 9 OBQ:6, 12, 32, 33  Ch. 9 CBQ:6, 12, 20, 32

 Are you ready for HKDSE 2018?

 A subject that deals with handling data  4 Key stages of statistics:  Collection of Data  Get data for study  Organization of Data  Group data by table, by order  Presentation of Data  Use diagrams to show data  Analysis of Data  Make some suitable conclusions

 Previous Information  Books, newspapers, magazines, websites, …  Questionnaire  Set out forms, questions on the websites, …  Observation  Sightseeing, counting, …  Experiment  Test, measurements, …  Interview  Written surveys, telephone conversation, …

 Discrete data ( 離散數據 ) are data with specific values and probably countable  E.g. size of shoes:, number of people in cinema  Remark: Nominal data ( 名目數據 ) are discrete such as favourite football players  Continuous data ( 連續數據 ) are data with approximate values and probably could only be grouped  E.g. height of students, degree of shortsight  Remark: Approximation on measurements could be treated as discrete

 Pages 214 – 215 of Textbook 1B  Questions 1 – 4  Page 95 of Workbook 1B  Questions 1 – 2

 Number of times visited Disneyland:  Tallying:  Frequency distribution table Number of times visited Disneyland TallyFrequency 0 //// //// //12 1 ////5 2 ///3

 Height of students (in cm):  Tallying in groups: Heights (cm) TallyFrequency 165 – 169 //// /6 170 – 174 //// //// – 179 ////4 180 – 184 //2

 Page 218 of Textbook 1B  Class Practice  Page 219 of Textbook 1B  Questions 1 – 4  Pages 98 – 100 of Workbook 1B  Questions 1 – 5  Missing table for SHW (I) Question 7

 Pictogram ( 象形圖 )  Bar chart ( 棒形圖 )  Pie chart ( 圓形圖 )  Broken-line graph ( 折線圖 )  Stem-and-leaf diagram ( 幹葉圖 )  Scatter diagram ( 散點圖 )

 Circle = all data  Sector = a particular item  Angle = ratio (to all data)  can be compared

 Steps:  Calculate the ratio of each item (can be in %)  Calculate the angle for each item  Draw a circle  Divide into sectors by the angles  Name the sector  Put down % or angle  Give a title

 A university is running a survey to find out the idols of 250 students. A pie chart shows different types of their idols.  (a) What percentage of the students choose famous people as their favourite type of idol?  (b) Find the value of x in the diagram.  Answers: (a) The required percentage = (100 – 72 – 6 – 2 – 4)% = 16% (b) x = 360 °  16%= 57.6°

 The pie chart shows the favourite ball games of a group of students. It is known 12 love volleyball.  (a)Find x.  (b)Find the total number of students in the group.  (c)Find the number of students whose favourite ball game is basketball.  Answers: (a) x = 360 ° – 110° – 85° – 60° – 30° = 75° (b) Let the total number of students in the group be N, then  N = 72 ∴ Total number of students in the group is 72. N  = ° 360°

 The pie chart shows the favourite ball games of a group of students. It is known 12 love volleyball.  (a)Find x.  (b)Find the total number of students in the group.  (c)Find the number of students whose favourite ball game is basketball.  Answers: (c) Number of students whose favourite ball game is basketball = 15 x 360° = 72  75 ° 360° = 72 

 Missing HW  Detention  SHW (I)  16 th April (Tuesday)  SHW (II) – to be confirmed  17 th April (Wednesday)  SHW (III) – to be given  17 th April (Wednesday)  OBQ – to be confirmed  17 th April (Wednesday)  CBQ  24 th April (Wednesday)

Enjoy the world of Mathematics! Ronald HUI