Look at Mia’s work. 83 + n = 110

83 + 83 + n = 110 + 83

n = 193

What was Mia’s error?

1. Mia’s work is correct.
2. Mia made an addition error when adding 110 and 83.
3. Mia only needed to add 83 to 110.
4. Mia should have subtracted 83 from both sides of the equation.

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)?