3short questions about stem-and-leaf !
1 how many twos would be listed in the stem area of a stem and leaf plot with the following data 12, 12, 22, 23, 33, 34, 36, 37, 48, 47?
a 1
b 3
c 4
d 2
2 how many twos would be listed in the leaf area of a stem and leaf plot with the following data 12, 12, 22, 23, 33, 34, 36, 37, 48, 47?
a 2
b 3
c 4
d 5
3 how many threes would be listed in the stem area of a stem and leaf plot with the following data 12, 12, 22, 23, 33, 34, 36, 37, 48, 47?
a 2
b 3
c 4
d 1

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)?