Question 1071807
There are 8 possible outcomes.
The distribution of heads for the eight outcomes is,
0H - 1
1H - 3
2H - 3
3H - 1
So the corresponding probability is,
0H:1/8
1H:3/8
2H:3/8
3H:1/8
The expected value is then,
{{{E=0(1/8)+1(3/8)+2(3/8)+3(1/8)}}}
{{{E=3/2}}}