Consider that the leading coefficient of the given quadratic function is positive, it means that y, for values of x => +oo, approaches to +oo too. And for x => -oo, the function approaches to +oo.
Then, based on the previous explanation, you can conclude that the end behavior of the given polynomial is:
Theoretical probability is the number of desired outcomes (heads) divided by the total number of outcomes (heads or tails). The actual outcome does not affect the theoretical probability. Mark is correct.