Sound City sells the TrueSound-XL, a top-of-the-line satellite car radio. Over the last 100 weeks, Sound City has sold no radios in three of the weeks, one radio in 20 of the weeks, two radios in 50 of the weeks, three radios in 20 of the weeks, four radios in 5 of the weeks, and five radios in 2 of the weeks. The following table summarizes this information.

Number of Number of Weeks.........................Radios Sold Having the Sales Amount
0 ..................................................................................................3
1.................................................................................................20
2.................................................................................................50
3.................................................................................................20
4..................................................................................................5
5..................................................................................................2

Compute a weighted mean that measures the average number of radios sold per week over the 100 weeks.