Why does the equation 9−2x−9−16x=−14x−7−4x−11 have no solutions?
1 answer:
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Answer:
Mean value is 0 and standard deviation is 1 after all test scores have been standardized by converting them to z-scores using z
Step-by-step explanation:
In a standard normal distribution (also called as <em>Gaussian distribution</em>) all values of the sample can be projected to a normal distribution with mean 0 and standard deviation 1 using their z-scores.
z-score of a value X can be calculated as follows:
z= where
- 50 is the <em>mean of the test scores</em>
- 6 is the <em>standard deviation of test scores</em>