According to a recent FCC survey, one in four cell phone users has experienced bill shock from unexpectedly high cell phone bills. A sample of 200 cell phone users was collected. Required:
a. What is the probability that more than 20% of cell phone users in the sample have experienced bill shock?
b. What is the standard error of the proportion?

With this question! what is process of elimination? ? p. s. my brothers acc got banned so add his new one @ yamauchiyamyam17

Mozart lenses inc. recently introduced seelites, a thinner lens for eyelasses. of a sample of 800 eyeglass wearers, 246 said they would purchases their next pair of eyeglasses with the new lenses. lenses inc. estimates that the number of people who purchase eyeglasses in a year is 1,700,000. most eyeglasses wearer buy one new pair of eyeglasses a year. what is the annual sales potential for the new lenses.

What is the solution set of the quadratic inequality x^2-5< or equal to 0