Gamma Distribution Homework: Estimating % Days > 10

[EvLer]

Homework Statement

so, I'm given some sample data: electricity consumption on randomly selected n days, and asked to model the problem using Gamma distribution, then the question is to estimate percentage of days on which consumption was > 10 by using moment estimates.

So, I can find the moment estimates for the two parameters: alpha number of exponentially distributed RVs each with mean lambda.
But I do not know how to relate the estimates of the parameters to the question I am asked!
could someone explain, please?

 

[gammamcc]

Really, you have to give the relevant formulas here to get more people (such as me) to try to help.