Mean (expected value) of a discrete random variable

A construction company is considering submitting bids for two contracts. It will cost the company $\mathrm{\$}\mathrm{10,000}$‍ to prepare and submit the bids, and if won, each bid would produce $\mathrm{\$}\mathrm{50,000}$‍ of income to the company. The company estimates that it has a $10\mathrm{\%}$‍ chance of winning any given bid.

Here is the probability distribution of $X=$‍ the number of bids the company wins, and $M=$‍ the amount of money the company profits from the bids.

${\mu }_M=$‍ dollars