Question

Suppose the test score of students in a class are normally distributed with a mean of 86 and a standard deviation of 4. What is the z-score for a student that scored 76 on a test

Answer 1

the answer is -2.5

Explanation:

Step 1:

Formula for z-score is:

z=(x-mean)/standard deviation

where x is the score for which z-score is required

Step 2:

x=76

mean=86

standard deviation=4

therefor;

z=(76-86)/4

z=(-10)/4

z=(-2.5)