Question

1. The Graduate Record E (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed.   
2. a. What percentage of the persons who take the test score above 1400?
3. b. What percentage of the persons who take the test score above 700?
4. c. Below what score do the bottom 30.9% of the test-takers score?

Answer 1

P(z<Z) table :

a.

b.

c.

for 30.9% percentile :

Z = -0.5

score = 1000 + (-0.5)*200

= 900

(please UPVOTE)