## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with data

### How we construct bar graphs in New Zealand

March28
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### Wearing Striped Pyjamas depends on the heat?

February7

The Royal Society of Open Science examined how well 29 environmental variables predict the variation in stripe characteristics of zebras across their range of habitats in Africa. The patterns of zebra stripes have fascinated scientists for a long time but, until now, there has been no mathematical explanation for them. In contrast to recent findings, […]

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### Skew…

October29

“Skew” means “slant” or “leaning”. For example, looking at this picture of the Leaning Tower of Pisa (taken by H3 recently): We can say that the tower is “askew” or skewed” – it has an obvious lean to the right (from where the picture was taken – from some angles it doesn’t appear to lean […]

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### data storage progress…

August11
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### Damned Data, just the way you want it!

June18

“Lies, damned lies and statistics! This interview focuses on the rapidly changing New Zealand property market, but don’t let that put you off! The first half has strong statements about the way companies use (er, “manipulate”) data for their own ends! Why do two companies have different results from the same data? Who controls the […]

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### Lies, Damned Lies and Statistics

May26

Mark Twain made popular the quote, “Lies, damned lies, and statistics” to describe the ability of some people to use the power of numbers to persuade others to believe their viewpoint, particularly to give statistical support for weak arguments. Take this graphic for example: “It is hard to imagine how to construct a less informative […]

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### Gapminder – seeing data differently over time

October21

Gapminder is a useful tool for students to see trends in data in powerful ways:

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### America’s Cup by the Numbers

September25

The Formula 1 of yachting – the America’s Cup. Outstanding technology where the boats are now sailing over twice the speed of the wind. Also a victory as Oracle came from 1-8 wins behind to beat Team New Zealand 9-8. How did this ‘one of the greatest comebacks in sport’ happen? It was all down […]

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### Humungous New Data Centre

August2

The National Security Agency (NSA) recently opened their new data collection centre in Bluffdale, Utah. The new \$1.5 billion dollar facility covers nearly one square kilometre just outside Salt Lake City. The low, four-level facility spans 93,000 square metres and requires 3,800 cubic metres of water and 65 megawatts of electricity per day. The electric bill […]

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### Global Data heats up…

April24

From 1971 to 2000, the world’s land areas were the warmest they have been in at least 1,400 years, according to a new study inNature Geoscience. The massive new study, involving 80 researchers from around the world with the Past Global Changes (PAGES) group, is the first to look at continental temperature changes over two […]

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#### Post Support

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)?]