# Category Archives: Mathematics

## Relationship between Car Insurance Price and Population Density

There was some discussion in my office today about the correlation between car insurance prices and where you live. The idea being that the prices are correlated with population density.

## New Pound Coin

Anyone who knows me / has been lucky (!) enough to have been on a maths or physics course taught by me will know how I like to moan about the mathematics of the new pound coin…

## Number of days until first Premier League manager sacking

I’ll get straight to the point, on average the first Premier League manager is sacked after 77 days.

## Easy way to remember sin, cos and tan values

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.

## Correlation between Astronaut name and Apollo mission

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

## Math(s) can be confusing…

I 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

The 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

As 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 … Continue reading

## Graphical Analysis of Grey’s Anatomy Viewing Figures

I 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. … Continue reading

## Velocity Required for Loop the Loop

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