Question 624479
The probability distribution is given by


x---P(x)
0---1/16
1---4/16
2---6/16
3---4/16
4---1/16


Where 1,4,6,4,1 is the fourth row of Pascal's triangle (which comes from a *binomial* expansion).


The expected value, E(x), is simply (1/2)(4) = 2.