The Ramshead Pub sells a large quantity of beer every Saturday. From past sales records, the pub

Question:

The Ramshead Pub sells a large quantity of beer every Saturday. From past sales records, the pub has determined the following probabilities for sales:
Barrels ..... Probability
6 ........... 0.10
7 ......... 0.20
8 ......... 0.40
9 ......... 0.25
10 ......... 0.05
1.00
Compute the expected number of barrels that will be sold on Saturday