Question

Did I answer correct?? Red is my answers.
The Graduate Record Exam (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. For each of the following problems:

(a)  Indicate the percentage or score called for by the problem.

a.     What percentage of the persons who take the test score above 1400?

Z score = (1400-1000)/200 = 2

P(z> 2) =1- 0.97725=  0.02275           2.275%

b.     What percentage of the persons who take the test score above 700? ___

Z score= (700-1000)/200= -1.5

P(z>-1.5)=1   1- 0.06681 = 0.93319              93.32%

c.      Below what score do the bottom 30.9% of the test-takers score? 900

= – 0.5

900-1000/200= -0.5

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