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Scores on an aptitude test are approximately normal with a mean of 100 and a standard...

Scores on an aptitude test are approximately normal with a mean of 100 and a standard deviation of 20. A particular test-taker scored 125.6. What is the PERCENTILE rank of this test-taker's score?

A. 50th percentile.
B. 10th percentile.
C. 90th percentile.
D. 95th percentile
E. None of the above.

The proportion of z-scores from a normal distribution that are LARGER THAN z = -0.74 is

A. 0.23
B. 0.38
C. 0.80
D. 0.77
E. None of the above.

(c) The proportion of z-scores from a normal distribution that are LESS THAN z = 1.17 is

A. 0.24
B. 0.88
C. 0.12
D. 0.85
E. None of the above.

Math   Statistics-And-Probability   
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