Suppose that many large samples are taken from a population and that the sample proportions are normally distributed, with a mean of 0.22 and a standard error of 0.029. What is the 99.7% confidence interval?

Use the normal approximation to the binomial distribution to answer this question. fifteen percent of all students at a large university are absent on mondays. if a random sample of 12 names is called on a monday, what is the probability that four students are absent?

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

What is the area of the shaded sector?