Each year a magazine publishes a list of the richest people in the county. In the last years issue, the six richest people and their wealth are as shown in the following table. Consider these six...

Each year a magazine publishes a list of the richest people in the county. In the last years issue, the six richest people and their wealth are as shown in the following table. Consider these six people a population of interest. Complete parts (a) through (e) below.

Calculate the mean wealth, u, of the six people.

u=$_ billion