Two friends race against each other in 100-meter and 800-meter races. Of the 200 races they ran this year, the wins, losses, and ties are shown below.

100 meter (Event D)

800 meter (Event E)

A won the race (Event A) 30 50
B won the race (Event B) 60 25
A and B tied (Event T) 10 25

What percentage of all the races are ties?

If someone wins the race today, is it more likely for A to win or B to win? How much more likely?
show your work.

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

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)?

How many and of which kind of roots does the equation f(x)=2x^4−9x^3+17x^2−16x+6 have?