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Posts tagged with statistics

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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White Island volcano erupts: reports of injuries in NZ

December9

News Flash: “An eruption is currently happening at White Island. Unconfirmed reports said up to 19 people were on or near the island at the time of the eruption and a rescue helicopter is on the way. Some of the people on the island have critical injuries.” Source: NZ Herald. So, this begs the mathematical question – […]

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Dance of the Pythagorean Triangles …

October3

You saw it here first, and H3 saw it on its world tour (not quite earning what Ed Sheeran did on his recent tour) but still pretty cool. Now, getting back to Ed, here are the stats: According to The Sun, the pop star paid himself a whopping NZ$33.6 million – the equivalent of $92,000 […]

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The Privacy Puzzle Improved

July14

A team of Reed Statistics students won first place in a prestigious national competition for an innovative algorithm that helps researchers glean information from datasets—without compromising individual privacy. That right – a technique for ensuing your privacy while allowing statistical analysis of data! Zeki Kazan ’20, Kaiyan Shi ’20, and Simon Couch ’21 (seen here) […]

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A day of remembrance …

May28

Memorial Day – a few statistics: Memorial Day in the USA marks the beginning of summer. Barbeques and parties dominate the holiday. Americans will consume 818 hot dogs every second from Memorial Day to Labor Day (seven billion in total), and spend $1.5 billion on meat and seafood over the weekend. More than forty-two million […]

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Math to the Max

May11

How safe is the Boeing 737 MAX series? This emotive question requires us to do some mathematics. In its current implementation the 737 MAX is no safer than first generation jetliners flying in the late 1950s to early 1960s: types that included the Comet, Caravelle, BAC-111, Trident, VC-10, early 707, 720, DC-8 and Convair 880/890. […]

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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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“It’s all about numbers!”

December28

It was one of those nasty family surprises – a family member having an emergency visit to hospital. As the nurse was making the patient comfortable, she was also busy checking the vital stats and noting them down in her log. Her comment was, “It’s all about numbers and I can’t do my job without […]

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Media hypes change in exchange rate with poor graphing?

November1

NZ dollar spikes on prospect of wage inflation … So read the headline (source here), followed by this brief explanation: “ANZ senior economist Sharon Zollner noted the New Zealand dollar had taken a pounding, post-election, but shot up from US68.49c before the data’s release to a peak of US69.14c on the back of the data, […]

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Dice Cricket – how will your team go?

July26

There are several variations of using dice to investigate chance and statistics. In this version, which works well in Junior High, students captain a cricket team and have a total of 11 players. Each player scores runs by rolling the die and using the number rolled to equal their runs. You can keep adding up […]

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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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