Concept explainers
Stats test The
Find the number of points scored by Gregor.
Answer to Problem 1E
The number of points scored by Gregor is 65.
Explanation of Solution
Given info:
In a Stats exam, the mean score is 75 points and the standard deviation of score is 5 points. The z-score of Gregor is –2.
Justification:
The z-score of a variable X taking value x is,
Where
From the above equation, the number of points scored by Gregor can be obtained as follows:
Substitute
Thus, the number of points scored by Gregor is 65.
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