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E-Math: Drawing and Understanding of Cumulative Frequency Curve (Step by step working included)
3 Comments | Posted by alwaysLovely in E-Math, Weekly Question
Let’s use this question to discuss on drawing and using cumulative frequency curve.
(Click on image to enlarge)
(a) Drawing of cumulative freq curve
(Click on image to enlarge)
Step by step solutions:
Notes:
140 pupils weigh 72.5 kg or less. So if you are interested to find out the number of pupils who weigh more than 72.5 kg. It will be 280 (total number of pupils) – 140 = 140 pupils.
Special attention to (iii) no. of students who weigh more than 65kg. By going UP & ACROSS, we get 20 students. This only means 20 students weigh 65 kg or less. So the rest (280 – 20 = 260) will weigh more than 65 kg
In my next post, I will be discussing the features of box and whisker plot.
Related Posts:
- E-Math: Summary of Cumulative Frequency & Box Whisker Plot
- E-Math: 5 Features of Box and Whisker Plot You Must Know
- Need graph paper but had none at home!
- E-Math: How to Use the Mean and Standard Deviation Formula (Plus: Calculator Shortcuts)
3 Comments for E-Math: Drawing and Understanding of Cumulative Frequency Curve (Step by step working included)
singaporeolevelmaths | E-Math: 5 Features of Box and Whisker Plot You Must Know | January 14, 2009 at 10:49 pm
E-Math: Summary of Cumulative Frequency & Box Whisker Plot | February 26, 2010 at 3:07 pm
[...] E-Math: Drawing and Understanding of Cumulative Frequency Curve (Step by step working included) [...]
hann's mummy | February 26, 2010 at 6:10 pm
In case, you didn’t know, drawing of cumulative Freq curve is out of syllabus.
We do teach them in school as knowledge but students are not required to know how to draw the c.f.curve.
Therefore, Qns like those in (a) will not come out.
They do have to know how to read and interpret it though.
so a more likely Qn would be one where the c.f.curve is given and students are to answer Qn as in (b).
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[...] to what was previously discussed in Statistics in Drawing & Understanding of Cumulative Frequency, here are the 5 features for a Box & Whisker Plot (I guess you would know which part represents [...]