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Posts tagged with graphs

Public Servants in NZ Government

February3

In New Zealand there has been much debate about reducing the number of public servants – those people employed across a range of agencies. To help define this group, here is a unique visual representation. Graphs, used well, have the power to define and explain, and mathematicians often use them in this way. You can […]

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Fear and Greed in a Dynamic Pie Graph

July8

The Fear & Greed Index is a way to gauge stock market movements and whether stocks are fairly priced. The theory is based on the logic that excessive fear tends to drive down share prices, and too much greed tends to have the opposite effect. How is Fear & Greed Calculated? The Fear & Greed […]

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Looking at buildings can produce headaches. Math explains why.

July31

“It’s three o’clock. You’re at work, struggling to focus during the afternoon lull. You gaze out of your office window, hoping for some relief, but instead you feel a headache coming on. Flat gray concrete lines the streets, while windows form repetitive glassy intervals in stark brick walls. With monotonous straight lines as far as the […]

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Worst Graph of 2020?

December18

Imagine the scenario – as a mathematician you have been tasked to put nine line graphs of economic indicators onto one set of axes. Here is the result: Would you be pleased with this visual display? What is missing, or how could it be improved? See some suggestions in Post Support. [source: NY Times]

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Another Dubious COVID Graph

May26

What is wrong with this graph – an official one designed to help the UK public understand COVID-19. Here, we see a humped curve that slowly decreases and suggests steps to ease lockdown along the way. Critically, there is no relation between the steps in the graph and the alert level, so we have to […]

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What’s wrong with this Cold-19 Graph?

May14

The following graph was released today and, at first glance, seems to put New Zealand at the forefront of testing for COVID-19. However, there are some problems with it, giving our growing mathematicians an excellent object lesson in visual data. The graph, which uses data supplied by health agencies from around the world, has been […]

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A not entirely useless graph?

March16

The following graph came with a slider to change the number of people affected by the Covid-19 virus. However, there are no x or y-axis scales, therefore giving no really helpful information for the number/ratio/percent of infected people that will enable medical systems to cope. In other words, it is a rather simplistic graph that […]

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And, for more Math fun, graph y=x to different powers!

February5
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Coronavirus vs SARS Graphical Error

January27

New of the fast spreading coronavirus is cause for deep concern, as well as action to contain those who have been affected. However, H3 noticed a rather erroneous graph which attempted to compare coronavirus with the SARS virus. What is wrong with this representation? (see the Post Support column for a possible answer):

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Gold Increases by 300%!

February19

This gold chart (source: Kitco.com) appears to show a dramatic – over 300% – increase in the value of gold over a period of just 7 hours on February 15th, 2019.  Students learning Mathematics and Statistics must exercise their detective instincts when viewing data in graphical form and this is an excellent example. Of course, […]

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« Older Entries

Post Support

Largest number between o and 1 million which does not contain the ‘n’ is 88

 

Rotation SAT Problem: Answer: 4 (see: https://www.youtube.com/watch?v=FUHkTs-Ipfg)

 

Which number has its letters in alphabetical order? Answer: F O R T Y

Hidden Rabbit? Clue: check the trees

How long for the stadium to fill? 45 minutes.

Where are you? the North Pole

Prize Object Puzzle: If Sue does not know where the prize is in the first question, it can’t be under the square. She must have been told it is under another shape. Apply this same logic to Colin. It is then obvious that the prize cannot be under a yellow object. That helps Sue eliminate her yellow shapes. Got the idea?

Algebra Puzzle: Answer = 1

Popular Math Problems Answers: 1, 1

Number of tabs? According to Lifehacker, the ideal number of tabs you should have open is nine. Yes, a single digit. To some, this is like playing a piano and only using a fraction of the notes!

Worst Graph? Where to start. What a visual mess and even some of the lines merge and are impossible to follow. A graph is a visual display of data, with the goal to identify trends or patterns. This is a spider’s web of information which fails to show a clear pattern at all. Solution? Well, different colors would help, or why not group in two or three graphs where trends are similar?

Number of different nets to make a cube is eleven – see this link

Homework Puzzle; The total value of the counters is 486, so halve this to get 243. Now, arrange the counters to equal this amount twice.

The graph on the left (Coronavirus) is for a time period of 30 days, while the one on the right (SARS) is for 8 months! Very poor graphical comparison and hardly relevant, unless it is attempting to downplay the seriousness of the coronavirus?

10 x 9 x 8 + (7 + 6) x 5 x 4 x (3 + 2) x 1 = 2020

NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]

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