the z-score corresponding to X = 24 and the X value corresponding to z = 1.50 for each of the following samples.

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Find the z-score corresponding to X = 24 and the X value corresponding to z = 1.50 for each of the following samples. Type the z-scores to two decimal places.
M = 20 and s = 12 z = 
 
X = 
 
M = 20 and s = 4 z = 
 
X = 
 
M = 30 and s = 8 z = 
 
X = 
 
M = 30 and s = 10 z = 
 
X = 
 
A score that is 20 points below the mean corresponds to a z-score of z = –0.50. What is the standard deviation?
Standard deviation = 
 
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