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If a student scored 92 on a test where the mean score was 78.4 and the standard deviation was 4.3 the student z score is?

User Aprill
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1 Answer

2 votes
Answer: 3.1627907

Work:
The formula for calculating z scores is
(given value) - (average value)
-----------------------------------------
(standard deviation)

You plug in the given values from the question, which gives you
(92) - (78.4)
----------------
(4.3)

Solving that expression in a calculator gives you the value 3.1627907. This is your z score.
User Spirit
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