Which of the following is an advantage of using stratified random sampling? Stratified random sampling saves time and money.
Stratified random sampling requires knowledge of the entire population.
Stratified random sampling can be used even when there is not a list of the population.
Stratified random sampling provides more precise estimates than simple random sampling.

Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11

Someone answer this asap for gabriella uses the current exchange rate to write the function, h(x), where x is the number of u.s. dollars and h(x) is the number of euros, the european union currency. she checks the rate and finds that h(100) = 7.5. which statement best describes what h(100) = 75 signifies? a. gabriella averages 7.5 u.s. dollars for every 100 euros. b. gabriella averages 100 u.s. dollars for every 25 euros. c. gabriella can exchange 75 u.s. dollars for 100 euros. d. gabriella can exchange 100 u.s. dollars for 75 euros.

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq less than 132. the probability that a randomly selected adult has an iq less than 132 is?