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10 questions
A data set has a mean of 290 and a standard deviation of 20. Calculate the z-score for 265.
z=250.5
z=1.25
z=−1.02
z=−1.25
A data set has a mean of 20 and a standard deviation of 3. Calculate the z-score for 23.
z=−1
z=16.33
z=1
z=3
A data set has a mean of 300 and a standard deviation of 40. What value would have a z-score of z=−2 ?
298
296
220
380
Steve took his math test and scored an 88. If the class average was a 78 with a standard deviation of 5, what percent of students earned a grade that was higher than Steve's grade?
97.5%
93%
5%
2.5%
What does it mean to have a z-score of z=0 on a quiz?
It means you did better than zero people.
It means you scored the same grade as the average grade.
It means you earned a zero on the quiz.
It means the average score was a zero.
Use the image of the normal graph provided. What is the value of the mean?
6
34
52
70
Use the image of the normal graph provided. What is the value of the standard deviation?
6
12
36
18
Use the image of the normal graph provided. What percent of values are less than 46?
16%
84%
46%
12.5%
What percent of scores are below a z-score of z=−1.02 ? (Use either the attached image of a z-table or use your own copy of the z-table from your notes)
15.87%
15.39%
9.68%
84.61%
What percent of scores are below a z-score of z=2.34 ? (Use either the attached image of a z-table or use your own copy of the z-table from your notes)
99.04%
0.96%
98.93%
97.68%
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