Respuesta :
Answer:
-1.75.
Step-by-step explanation:
The z-score = (n - m) / d where n is the value (13) m = mean and d = standard deviation.
= (13 - 20) / 4
= -1.75 (answer)
The value of z score = -1.75.
What is a Normal Distribution ?
The normal distribution, is a symmetric probability distribution centered on the mean, indicating that data around the mean occur more frequently than data far from it.
It is also known as the Gaussian distribution.
It is given in the question
a normal distribution has a mean of 20 and a standard deviation of 4.
z-score of 13 = ?
The z-score = (n - m) / d
where n is the value (13)
m = mean and
d = standard deviation.
= (13 - 20) / 4
= -1.75 .
Therefore the value of z score = -1.75.
To know more about Normal Distribution
https://brainly.com/question/15103234
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