I have a statistic problem that reads a company has 100 employees and gives their employess different wages. In table form it has

Hourly wage 8.65 9.05 9.75 10.10 12.20 14.25

Proportion 21 17 23 22 16 1

What is the expected value of wages for a new employee?

I can do it when I have probability, but I know that there is something else that I need to do to this before I figure out the answer.......HELP!!!!!My exam is tomorrow!!!!