A normal random variable x has an unknown mean and standard deviation. The probability that x exceeds 4 is 0.975, and the probability that x exceeds 5 is 0.95.
Find 
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Find 
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Definitions:
Reliability Coefficient
The reliability coefficient is a measure that assesses the consistency or stability of a test score or instrument over time.
Correlation
Correlation is a statistical measure that expresses the extent to which two variables change together. If the variables tend to increase and decrease in relation to each other, the correlation is positive; if one increases as the other decreases, it is negative.
Construct Validity
The degree to which a measurement device accurately measures the theoretical construct it is designed to measure.
Reliability
The consistency and stability of measurements or assessments over time.
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