3Thavo §8.2 (A) and §10.2 (B)

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 3

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A: §8.2 Grouping data

B: §10.2 Altitude

An introduction for Math B pupils follows now!

(Math A pupils, please follow this too.

It only takes a few slides and then I've got an introduction to your paragraph!)

So the subject for today is: the ALTITUDE (=hoogtelijn).

Of course the Challenge path is your learning path!

Comment:

As you see in the Solution of 12bcd, you need:

+ a pencil

+ a geo triangle (straight lines, angle of 40 degrees)

+ a pair of compasses

+ forgetting these things is impossible now, because you are at home!!

Question: Which basic rule for angles of triangles is used many times here?

Basic rule angles triangle:

Answer:

The 3 angles together are 180 degrees.

Homework time for Math B

slides for Pupils Math A come up now !

Math B pupils, Good luck, doing §8.2!

Math A, §8.2 Grouping data

A few fine points!

+ first a bit of Theory, then

+ 2 questions 

What's the point of 'Grouping data'?

If you have a chaotic heap of numbers, it's hard to see any meaning or structure in it...

Just watch the next slide!

It is from exercise 10, page 15.

Pretty chaotic content, isn't it?

The previous slide was about prices of hotel rooms.

By grouping them, these prices make much more sense!

See next slide.

This is an orderly Grouped Frequency table.

In the next slide, fill in the midpoints of the first 2 classes!

What are the midpoints of the first 2 classes?

Answer:

35 and 45 are the midpoints

The class with Highest Frequency is the MODAL CLASS.

Write down the modal class in the next slide!

What is the modal class?

Answer: modal class is: 

The final new thing in § 8.2 is:

calculating the Mean of Grouped data.

Important:

take into account that not every number appears with the same frequency! That's why you have to multiply all numbers by their frequency.  

 After adding up all those outcomes,  divide by the total frequency!

Confused? You won't be after the coming 

+ Method   and 

+ Example!

Still not quite clear? 

Just work your way through § 8.2 and it will become clear.

By participating in the LessonUp you already have some idea of all the content. There will still be more for you to find out, now!

Homework time

+  Good luck doing §8.2!

+  When you are stuck and the Solutionsbook is not clear enough for you,

+  you know how to contact me (google classroom or also mail) and I will        provide you with an explanation as soon as I can. In or outside of the Lesson!