What goes up must come down. Water pressure is proportional to depth. 8.5 Application to Distribution Functions 1. The distribution of the number of years of education completed by adults in a population is approximately by a formula. With the distribution of ages approximated by a graph consisting of line segments, the slope of the distribution after age 40 was chosen arbitrarily.
Every distribution function has a cumulative distribution function.
A probability is a number which is the value of an integral. The median age of people in the US, using the distribution function in the text is 36 years. Determining the mean age of a population requires knowing the actual size of the population. A large standard deviation for a normal distribution tells us that the data is close to the mean.