Hello,

I am looking for some direction with the following examples. What formulas can I use to obtain answers?

12. For a normal distribution with = 500 and = 100, a. What is the percentile rank for X = 550? b. What is the percentile rank for X = 650? c. What is the percentile rank for X = 450?

13. For a normal distribution with = 200 and = 50, a. Find the X value for the 90th percentile b. Find the X value for the 30th percentile c. Find the X value for the 75th percentile

14. Find the proportion of the normal distribution that is located between the following z-score boundaries: a. Between z = 0.25 and z = 0.75 b. Between z = -1.00 and z = +1.00 c. Between z = 0 and z = 1.50 d. Between z = -0.75 and z = 2.00