Given that mean of a normal variable X is 12 and standard deviation is 4, then find the Z-score of data point 20.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 2
Given $μ = 12$ and $σ = 4$
$∵x = 20$
$∴ Z=\frac{x-μ}{σ}=\frac{20-12}{4}$
$=\frac{8}{4}= 2$