How to calculate EV of this proposed investment?

[Bill C]

As part of my retirement portfolio, an advisor has suggested I purchase a "high yield" bond in a company that has some chance of going under during the 3 year term of the bond. Obviously he feels it is unlikely that it WILL fail, but admits there is perhaps a 10% chance the company will fail. The bond is yielding approximately 10%.

How do I calculate EV here, and how can I best understand the risks involved in terms of mathmatics?

Any help would be greatly appreciated.

bill c