Asurvey of high school juniors found that 82% of students plan on attending college. if you pick three students at random, what is the probability that at least two plan on attending college?
i know the equation is:
ncx(p)^x(q)^n-x
but i cant remember what variable means what..

One-third of the people from country a claim that they are from country b, and the rest admit they are from country a. one-fourth of the people from country claim that they are from country a, and the rest admit they are from country b. in a combined census of the two countries, one-half of the total claimed to be from a. what is the ratio of the populations of country a to that of country b.

The weight of an object in a particular scale is 175.2 lbs. the measured weight may vary from the actual weight by at most 0.1 lbs. what is the range of actual weights of the object

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals