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Complete Question
In a test with a mean of 100 and a standard deviation of 10, what is the standard score for a test score of 120?
Answer:
The standard score = 2
Explanation:
The formula for Test (T) score is given as:
T score = zσ + μ
z = Standard or z score = ??
Standard deviation (σ) = 10
Mean (μ) = 100
Test score = 120
120 = 10z + 100
120 - 100 = 10z
20 = 10z
z = 20/10
z= 2
Therefore, the standard score = 2