Question

each year, forbes magazine compiles a list of the 400 richest americans. as of september 19, 2012, 8 of the top 10 on the list are as shown in the accompanying table. determine the range and sample standard deviation.
click the icon to view the table of 8 of the top 10 richest americans.
the range is $ billion.
(type an integer or a decimal. do not round.)
top 10 richest people in a country
person\twealth ($ billions)
bill gates\t66.0
warren buffett\t46.0
david koch\t31.0
charles koch\t31.0
christy walton and family\t27.9
alice walton\t26.3
s. robson walton\t26.1
michael bloomberg\t25.0

Explanation:

Step1: Identify maximum and minimum values

The maximum wealth value is $66.0$ billion (Bill Gates) and the minimum is $25.0$ billion (Michael Bloomberg).

Step2: Calculate the range

The formula for the range is $R = \text{Max}-\text{Min}$. So, $R=66.0 - 25.0$.

Answer:

$41.0$