general maths
posted by maths .
A study of motor vehicle rates in the 50 states reveals
that traffic death rates (deaths per 100 million motor
vehicle miles driven) can be modeled by the normal
curve. The data suggest that the distribution has a mean
of 5.3 and a standard deviation of 1.3. Sketch the normal
curve, showing the mean and standard deviation.

The following link will give a good introduction to the concepts of a normal distributtion curve. Note that the article uses μ for mean, and σ for standard deviation.
http://en.wikipedia.org/wiki/Normal_distribution