One dimension of bird beaks is "depth"--the height of the beak where it arises from the bird's

head. During a research study on one island in the Galapagos archipelago, the beak depth of all

Medium Ground Finches on the island was found to be normally distributed with mean y = 9.6

millimeters and standard deviation o=1.1 millimeter. What is the probability that the mean

depth in 15 randomly selected Medium Ground Finches is at least 10 millimeters?

There are two major tests of readiness for college: the act and the sat. act scores are reported on a scale from 1 to 36. the distribution of act scores in recent years has been roughly normal with mean µ = 20.9 and standard deviation s = 4.8. sat scores are reported on a scale from 400 to 1600. sat scores have been roughly normal with mean µ = 1026 and standard deviation s = 209. reports on a student's act or sat usually give the percentile as well as the actual score. the percentile is just the cumulative proportion stated as a percent: the percent of all scores that were lower than this one. tanya scores 1260 on the sat. what is her percentile (± 1)?