I am needing help calculating:

* Expected profit for pipeline

* Variance for pipeline

* Expected profit for alternative investment

* Variance for alternate investment

I left out some info that I used.

Assume there is a 10% probability of the pipeline leaking, with an expected liability of $3.2 billion which will be deducted from total profit. There is a 90% probability the pipeline will not leak. Determine the expected return on this investment, as well as the variance.

The firm also has an alternative investment which will yield $1.6 billion over the course of the same 15-year period, with a probability of 80%, or $1.15 billion with a probability of 20%. Calculate the expected return, as well as the variance. The risk should be expressed as the standard deviation.

I would appreciate any help!