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Alex787 [66]
3 years ago
13

On a recent quiz, the class mean was 72 with a standard deviation of 4.1. Calculate the z-score (to 2 decimal places) for a pers

on who received score of 86. Is a quiz score of 86 considered unusual?Unusual ?Not Unusual?
Mathematics
1 answer:
musickatia [10]3 years ago
3 0

Answer: Yes, a quiz score of 86 is considered unusual.

Step-by-step explanation:

Given : The class mean : \mu=72

Standard deviation : \sigma=4.1

Le X be the random variable that represents the scores of student.

The formula of z-score :-

z=\dfrac{x-\mu}{\sigma}

For x= 86

z=\dfrac{86-72}{4.1}=3.41463\approx3.14

Since the z-score id greater than 1.96 , therefore , it is unusual.

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