Statistics for Maintenance Modelling: Continuous Lifetime Distributions 2

# The Hazard Function for the Normal Distribution¤

Although there is no analytical expression for the hazard function resulting from a normal distribution, it is increasing (and its rate of change / gradient is increasing) as is illustrated here.

Click here to find out how to calculate the Normal distribution in Excel.

The probability density function stemming from a study of over four hundred 40 watt light bulbs is shown on the right. The normal distribution with mean 1065 and standard deviation 191 is also shown over the data.

This data set is based on the one illustrated by Cox (1998) on page 16.