## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with probability

### Jesus the Messiah? What are the odds, mathematically?

December7

What are the Odds? Professor of mathematics, Peter Stoner (June 16, 1888 – March 21, 1980), gave 600 students a math probability problem that would determine the odds for one person fulfilling eight specific prophecies. (This is not the same as flipping a coin eight times in a row and getting heads each time.) First […]

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### An Introduction to Probability ppt

November25

Here is a helpful Introduction to Probability, including the Monty Hall problem (The Monty Hall problem is a brain teaser, in the form of a probability puzzle, loosely based on the American television game show Let’s Make a Deal). Adapted from an unknown source. Probability Intro-1i2cn0v

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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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### Maths from the Monty Hall of Fame

July14

Monty Hall (left) was a game show host on “Let’s Make a Deal” who offered contestants a brand new car. All they had to do was choose the lucky door out of 3 possibilities. There was, clearly a 33.3% chance of choosing the car, right? Yes…right! However, after you chose a door, Monty Hall would, […]

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### Spring is coming, but how do plants know?

February17

Spring is sprung The grass is riz I wonder where the Math is! Yes, there lies a puzzle. How do plants know it is time to blossom and accept that spring has arrived? As Bill Finch said, in a recent article on the Mathematics of Spring, “You won’t find your spring on a calendar. There […]

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### Lightning and Lotteries – What are the odds?

November23

The Mathematics of Probability is a fascinating one, and every day we take our chances in a variety of different situations (actually, some of our students take big chances every day, simply by running around corners without looking!). Impossible means a probability of 0; while certainty is a probability of 1.0 – that is, every […]

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### Winning the Lottery – what are the chances?

September21

By the numbers (adapted from The New Zealand Herald) Lotto balls: 40 Balls needed to win Lotto: 6 Powerball balls: 10 Most common Powerball number drawn: 2 Biggest jackpots • Biggest Powerball jackpot: \$34.8 million in 2011 (shared by two players). • Biggest individual Powerball prize: \$28 million in 2010 (won by a single player). • […]

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### Mathematics on Trial

May2

An interesting article from the BBC shows the importance of Mathematical probability in courtroom trials: Read the full article on how Mathematics was used to overturn convictions here.

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### Paradox of sharing the same birthday…

March28

How many people need to be crowded into a room before two of them are likely to have the same birthday? The answer is a mere 23 to have a fifty-fifty shot. To bring the probability to ninety-nine percent, you need a crowd of only 57 people. And yet there are three hundred and sixty-five […]

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### Coincidences

May30

“It is a small world, isn’t it? You are on holiday in the Pyrenees. You write a postcard to a friend at home and set off to post it. Then who should you meet but that same friend coming up the street. This not only saves you the cost of a stamp but it also provides […]

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#### Post Support

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)?]