One of my tutees showed me an easy way to remember sin and cos values for the “common” angles, and once you’ve got those you’ve also got tan, cosec, sec and cot.

# Category: Mathematics

## Correlation between Astronaut name and Apollo mission

Posted onPerhaps we’ve finally worked out Deke Slayton’s method for choosing the Apollo crews, basing it on alphabetical order…

## Math(s) can be confusing…

Posted onI meet a man walking down the street, who I know has two children. He introduces me to his son, what is the probability that his other child is a girl?

## Standard Deviation in IDL

Posted onThe built in IDL standard deviation function in IDL, STDDEV, uses the moment function which treats the standard deviation as a sample, rather than a population. A short programme can give us both options.

## Standard Deviation of Noise in TV Viewing Figures

Posted onAs discussed in my last post we found that ‘the standard deviation of the noise in viewers is about 20% of the range of viewers’ for Grey’s Anatomy. I wanted to see if a similar figure was true for other TV shows.

## Graphical Analysis of Grey’s Anatomy Viewing Figures

Posted onI recently started watching Grey’s Anatomy which I’ve been enjoying. However a friend of mine told me that the later episodes are not as good. So I thought I would have a look if the viewing figures reflected this.

## Velocity Required for Loop the Loop

Posted onChris (@chris2306) got asked how fast you would need to be going to complete a loop the loop. This is what we got.

## Largest Known Prime Number

Posted onWe have a new largest known prime number! So here is an obligatory post about prime numbers.

## It’s Snowing Outside!

Posted onI’m sitting in my office, at home, watching the snow falling outside and it got me thinking….

## The Crawshaw Method (for Quadratics)

Posted onSomething all GCSE maths students (and above) need to know, and something that a large number of people use everyday, is how to factorize quadratic equations. However I’m amazed how few people know a decent (and easy) way of doing this!