Those gifted with math...especially those statistics guys out there!!?

I'm a senior in high school, and I opted to take AP statistics instead of irrelevant senior electives like basketweaving and such. However, I've had a ton of trouble with this subject and fear I'm not going to pass, thus revoking my admission to the university i was accepted to, and loss of all my financial aid. Heres a question from my take home test, if you could explain this to me, it would help a TON!!

Find the probability that in 200 tosses of a fair die, we will obtain at least 30 fives.

helphelphelp!!

Since the number of tosses is large we can approximate this probability with the normal distribution.

The mean=np
The std. dev. =(np(1-p))^(1/2)

Also, we need to find P(x>29.5) since we are approximating a discrete distribution with a continuous distribution. Now just solve this like a normal distribution problem. The reasoning for all of this can be found in your textbook on the binomial approximation section.

Good luck on your test.

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