Answer:
2.2
Explanation:
to get the expected daily demand we have to multiply each daily demand by their probability  distribution and sum up the results
0 * 0.1 = 0
1 * 0.2 = 0.2
2 * 0.3 = 0.6
3 * 0.2 = 0.6
4 * 0.2 = 0.8
0 + 0.2 + 0.6 + 0.6 +0.8 = 2.2
From this calculation above, the expected daily demand has been summed up to 2.2
