According to Forbes.com, the numbers of billionaires in the five states in the Midwest with the most billionaires are given in the table.

Illinois ........20

Wisconsin ........10

Michigan .......10

Minnesota ........ 6

Ohio .......... 5

a. Find and report the mean number of billionaires per state in context: The mean number of billionaires in these five states is ________. (Report the number to the nearest tenth.)

b. Sketch a dotplot of the data, and mark the location of the mean. You can use a triangle under the axis (m, like a fulcrum) to mark the location; it should be at the balance point.

c. Find and report the standard deviation of the number of billionaires per state in context; round to the nearest tenth.

d. Which of the given numbers is farthest from the mean and therefore contributes most to the standard deviation?