Standard Deviation Exams Practice Review

Standard Deviation
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1. Which formula is used to calculate the standard devi- A
ation of sample data?

2. A set of data has a mean of 12 and a standard devia- The data point is
tion of 3. A data point of the set has a z-score of 1.3. 1.3 standard devi-
What does a z-score of 1.3 mean? ations away from
12.

3. A missing data value from a set of data has a z-score 39
of -2.1. Fred already calculated the mean and standard
deviation to be mc025-1.jpg and mc025-2.jpg. What
was the missing data value? Round the answer to the
nearest whole number.

4. The mean of a set of credit scores is mc021-1.jpg and 720
mc021-2.jpg. Which credit score is within a z-score of
3.3?

5. A set of data has a mean of 0.5 and a standard devi- The data point is
ation of 0.01. A data point of the set has a z-score of 2.5 standard devi-
2.5. What does a z-score of 2.5 mean? ations away from
0.5.

6. A scientist collected two sample sets of snowfall data. standard deviation
Which statistic should he use to compare the spread
of the two sets of data?

7. Fiona recorded the number of miles she biked each D
day last week as shown below.

4, 7, 4, 10, 5

The mean is given by m = 6. Which equation shows
the variance for the number of miles Fiona biked last
week?

8. A poll worker analyzing the ages of voters found that 71
mc024-1.jpg and mc024-2.jpg. What is a possible voter
age that would give her zx = 1.14? Round your answer
to the nearest whole number.
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