MORE PRACTICE 1) In 2000, the world population was about 6.09 billion. During the next 13 years, the world
population increased by about 1.18% each year.
a. Write an exponential growth model giving the population y in billions) t years after 2000.
b. Estimate the world population in 2005.

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)?