What are the projects expected npv and standard deviation

Question

Please explain/show how to get the answers to this question using excel.

The managers of Merton Medical Clinic are analyzing a proposed project. The project's most likely NPV is $120,000, but, as evidenced by the following NPV distribution, there is considerable risk involved:

Probability       NPV

0.05                 -700,000

0.2                   -250,000

0.5                   120,000

0.2                   200,000

0.05                 300,000

What are the project's expected NPV and standard deviation of NPV?