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The mathematics section of the act test has mean of 20.9 and a standard division of 5.3 for years 2013 to 2015. What is the Ross score of a test with a Z score of -1.50 give answer to two decimal places

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Answer to a math question The mathematics section of the act test has mean of 20.9 and a standard division of 5.3 for years 2013 to 2015. What is the Ross score of a test with a Z score of -1.50 give answer to two decimal places

Expert avatar
Birdie
4.5
103 Answers
\mu = 20.9
\sigma = 5.3
Z = -1.50
X = \mu + Z \cdot \sigma
X = 20.9 + (-1.50) \cdot 5.3
X = 20.9 - 1.50 \cdot 5.3
X = 20.9 - 7.95
X = 12.95

So the raw score is:
X = 12.95

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