The Princeton Review estimates that 70% of CofC students are in-state students. Assume we take a random sample of 10 CofC students. a) What is the probability that exactly 8 of the students are in-state students? b) What is the probability that 8 or more are in-state students? c) What is the probability that 7 or less are in-state students? Round your answers to 3 decimal places.

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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The Princeton Review estimates that 70% of CofC students are in-state students. Assume we take a random
sample of 10 CofC students.


a) What is the probability that exactly 8 of the students are in-state students?
b) What is the probability that 8 or more are in-state students?
c) What is the probability that 7 or less are in-state students?
Round your answers to 3 decimal places.

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In Step 2 of the answer, I don't understand how to calculate.

 P(X= 8) = 10C8*(0.70)8*(1-0.70)10-8

what is 10C8? where does the number come from? 

Then is it multiplied times (0.70)8

(1-0.70)10-8 does this equal (0.30)2?

If you multiply the three numbers you get the probability

 

Same goes for step 3

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