Analysis Of Grouped Data

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Analysis Of Grouped Data Day and date : Thursday 19 / 4 / 2012 Analysis Of Grouped Data The Cumulative Frequency Polygon المضلع التكراري التراكمي ( المتجمع الصاعد ) Objectives : 1 ) To graph the cumulative frequency polygon & the cumulative frequency histogram of grouped data. To estimate the median using the graph of the cumulative frequency polygon. 1) سوف يتعلم الطالب رسم المضلع التكراري التراكمي ورسم المدرج التكراري التراكمي . 2 ) سوف يستخدم الطالب رسم المضلع التكراري التراكمي لتقدير قيمة الوسيط لبيانات مجمعة في جدول تكراري ذو فئات الأهداف :

The Cumulative Frequency Polygon Day and date : Thursday 19 / 4 / 2012 The Cumulative Frequency Polygon المضلع التكراري التراكمي ( المتجمع الصاعد ) Startar Activity : نشاط البداية : Find the median of the following set of data : اوجد الوسيط لمجموعة القيم التالية : 7 , 9 , 5 , 7 , 8 , 4 , 6 4 , 5 , 6 , 7 , 7 , 8 , 9 Median = 7 Find the median of the following set of data : اوجد الوسيط لمجموعة القيم التالية : 7 , 9 , 5 , 7 , 8 , 4 , 6 , 5 Median = ( 6 + 7 ) ÷ 2 = 13 ÷ 2 = 6.5 4 , 5 , 5 , 6 , 7 , 7 , 8 , 9

Analysis Of Grouped Data Day and date : Thursday 19 / 4 / 2012 Analysis Of Grouped Data Example. the weights of a random sample of 36 students are shown in the table below.اوزان عينة عشوائية من 36 طالب موضحة بالجدول ادناه Graph the cumulative frequency polygon then Estimate the median of these weights. ارسم المضلع التكراري التراكمي ثم قدر قيمة الوسيط. 3 70 - 6 60 - 8 50 - 9 40 - 7 30 - 20 - frequency Mass ( kg )

The cumulative frequency polygon المضلع التكراري التراكمي Estimating the median تقدير الوسيط Intervals C. F. 20 18 30 40 50 60 70 80 3 6 9 12 15 21 24 27 33 36 ⇝ • • Σ f 2 36 18 = • Class f c. f 20 – 3 30 – 7 40 – 9 50– 8 60 – 6 70 – Total • 3 10 The cumulative frequency polygon المضلع التكراري التراكمي 19 27 • 33 36 Σ f = 36 • • ∴ median ≈ 49

المضلع التكراري التراكمي والمدرج التكراري التراكمي Cumulative Frequency polygon & Cumulative frequency histogram. 36 • C. F. 33 • المضلع التكراري التراكمي والمدرج التكراري التراكمي 30 27 • 24 21 Class f c. f 20 – 3 30 – 7 40 – 9 50– 8 60 – 6 70 – Total • 3 18 10 15 19 12 27 • 9 33 6 36 Σ f = 36 3 • ⇝ • 20 30 40 50 60 70 80 Intervals

⇝ worksheet 1) Draw the cumulative frequency polygon The grades of 25 students are given in the table below : درجات 25 طالب كما يلي : 1) Draw the cumulative frequency polygon 1) ارسم المضلع التكراري التراكمي 2) Use the graph to estimate the median 2) استخدم الرسم لتقدر قيمة الوسيط Intervals الفئات ( f ) ( c f ) 40 – 49 3 50 – 59 4 60 – 69 5 70 – 79 7 80 – 89 90 – 99 2 total C. F 25 20 15 10 5 ⇝ 40 50 60 70 80 90 100 Intervals

Revision worksheet 1) Complete the table. 1) اكمل الجدول The grades of 25 students are given in the table below : درجات 25 طالب كما يلي : 1) Complete the table. 1) اكمل الجدول 2) Find the mean of these grades. 2) اوجد المتوسط الحسابي لهذه الدرجات Intervals الفئات F C . C F × C.C 40 – 49 3 50 – 59 4 60 – 69 5 70 – 79 7 80 – 89 90 – 99 2 total 3) Find the modal class and estimate the mode. 3) اوجد الفئة المنوالية وقدر قيمة المنوال 4) Find the range of the grades. 4) اوجد المدى لهذه الدرجات. Σ f × c.c = Σ f =

• • • worksheet 1) Draw the cumulative frequency polygon The grades of 25 students are given in the table below : درجات 25 طالب كما يلي : 1) Draw the cumulative frequency polygon 1) ارسم المضلع التكراري التراكمي 2) Use the graph to estimate the median 2) استخدم الرسم لتقدر قيمة الوسيط Intervals الفئات ( f ) ( c f ) 40 – 49 3 50 – 59 4 7 60 – 69 5 70 – 79 80 – 89 23 90 – 99 2 total C. F • 25 20 15 10 5 • • 40 50 60 70 80 90 100 Intervals

Revision worksheet 1) Complete the table. 1) اكمل الجدول The grades of 25 students are given in the table below : درجات 25 طالب كما يلي : 1) Complete the table. 1) اكمل الجدول 2) Find the mean of these grades. 2) اوجد المتوسط الحسابي لهذه الدرجات Σ f × c.c Σ f = Mean = Intervals الفئات F C . C F × C.C 40 – 49 3 44.5 50 – 59 4 218 60 – 69 5 322.5 70 – 79 7 74.5 80 – 89 90 – 99 2 total 3) Find the modal class and estimate the mode. 3) اوجد الفئة المنوالية وقدر قيمة المنوال 4) Find the range of the grades. 3) اوجد المدى لهذه الدرجات. Σ f × c.c = Σ f =