With a convenience sample, a population is broken up into different subgroups and then simple random sample is our conducted within each of the subgroups

9/12 is the answer because 3/4 times 3 each is 9/12

29. because you will divide each number of months by 12 to find the number of years. which would mean, 5, 12.5, 16, 45, 50, 72.5. which is crazy. anyhow, i think you find the median in the middle. and yea hope your test goes good