Assume that GRE Verbal scores approximate a normal curve with a mean of 500 and

Question

Assume that GRE Verbal scores approximate a normal curve with a mean of 500 and a standard deviation of 100.

4.2.   A GRE training program will only admit individuals who scored in the bottom 30 percent of the distribution. In order to be admitted, a student must have received a score of ____________ or less.

(I've given you some wiggle room in the final answer. Don't show any decimal places, e.g. 550.123 on your calculator should be entered as 550)
Please enter a whole number, with no decimal point.

Explanation / Answer

The closest z score to the probability 0.30 (0.3015) is -0.52.

Thus, the required X value is: +z

=500-0.52*100

=448

In order to be admitted, a student must have received a score of _448_ or less.

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