http://www.aaa3.net/test-score-statistics/
Statistics and Probability – what is the probnability of a person receiving a specific score on a test?
The question is: An examination which is approximately normally distributed has a mean of 200 and standard deviation of 20. If a person who took the test is randomly selected, find the probability that the person has a score above 230. The answer is 6.7%. I'm having trouble finding a way to get this response. Thanks!
p (x> 230) = p (z> (230-200) / 20) = p (z> 30/20) = p (z> 1.5) = 1-p (z <1.5) (taking into account all areas under the curve is 1) 1 – (found in the table) = answer
2.3 Paired-Samples T Test: PASW (SPSS) Statistics v.17
