1. At Wilson High School, SAT verbal scores have approximately a normal distribution with a mean of 500 and a standard deviation of 100.
2. (a)What proportion of the students has SAT verbal scores that are at least 600?
3. (b)What proportion of the students has SAT verbal scores that are at least 400?
4. (c)Find an SAT verbal score such that only 10 percent of the students have scores above that value.