How to find out distribution's mode?

Link: http://i39.tinypic.com/14n2t0o.png

For 1c) It asks to give the distribution's mode. Well I never recall learning that anywhere on the book. How would I figure out what is the mode of it?

I figured out the table as soon below:

P(0) = 2.016e-8

P(1) = 9.8428e-7

P(2) = 0.000021625

P(3) = 0.00028155

P(4) = 0.0024056

P(5) = 0.014094

P(6) = 0.057343

P(7) = 0.15998

P(8) = 0.29291

P(9) = 0.3178

P(10) = 0.15516

But nowhere does any of those numbers match up to one another to be called a mode. So this has gotten me really confused.

*For 1B) Is the answer All real numbers?

*For 1D) Is the answer P(9) = 0.3178?

Thank you so much for your time!