11. Explain the difference between the two formulas binompdf(n, p, x) and binomcdf(n, p,x); Use the appropriate formula above to solve problems (a) and (b): The National Health Interview Survey reports that 40% of telephone users no longer use landlines, and have switched completely to cell phone use. Suppose we take a random sample of 10 telephone users. a. Find the probability that the sample contains two users who have abandoned their landlines. [first, identify n, p, x, and use the correct function ] b. Find the probability that the sample contains at most two users who have abandoned their landlines [first identify n, p, x, and then use the correct function] c. Use the Binomial probability formula to answer question (a) above 1 P(x) = C(n,x)PIQ"'x = x101" x)! X nix p q [first, identify n, p, q, and x]