A shipping department will deliver a product in one, two, three, or four days. What is the expected number of days given that the probability day one is .18, day 2 is .27, day 3 is .48?

Probability of
1 Day is 0.18
2 Day is 0.27
3 Day is 0.48
4 Day is 1-0.48-0.27-0.18=0.07

I think you're after the mode: 3 Days