## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with chances

### A Baby is Born 1 min into the New Year – What are the odds?

January1

As fireworks were fired off from Auckland’s Sky Tower to welcome 2018, the country welcomed the first baby of the new year. The healthy baby boy, weighing 3.5kg, was born at Auckland Hospital at 12.01am to a Howick couple on the first day of the new year. There are 526,600 minutes in a year, meaning […]

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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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#### 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)?]