Some students at Derin's school signed a petition asking for a reading area for recess. The graph below shows the number of signatures from each grade.
= 2 signatures
1 st
000
2nd
School grade
3rd
4th
Number of signatures
How many total signatures are on the petition?

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population, find the population standard deviation, o.79828588912497

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =

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)?