AFDA – Warm Up #9
Z
Pre Z-scores & Standard Deviation Quiz
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Name ______________________
Date ____________ Block _____
1. If a data set has a mean of 150 and a standard deviation of 25, what is the z-score of an
element with a value of 250?
2. If the mean of a set of data is 23 and the standard deviation is 4, what data value has a
z-score of -1.5?
3. IQ scores have a mean of 100 and a standard deviation of 16.
Albert Einstein reportedly had an IQ of 160. Madonna’s reported IQ
has a z-score of 2.5. What is Madonna’s reported IQ?
4. The table below lists the homework grade and the test grades of 10 students in a math
class.
Which set of grades has a higher mean?
Which grades are more consistent?
(The standard deviation is smaller.)
A new student comes to the class and earns a
homework grade of 78. What is her z-score
compared to the other homework grades?
Based on her z-score, is her homework grade,
below or above average? How do you know?