Quiz: Introduction to Numerical Measures

Use the stem and leaf plot below showing the running times in a 400 m run for 19 runners with 6|0 representing 60 seconds for questions 1 through 12.

equation

1. What is the minimum time?
a. 50
b. 58
c. 59
2. What is the maximum time?
a. 80
b. 81
c. 85
3. What is the range?
a. 27
b. 35
c. 85
4. What is the median?
a. 72
b. 73
c. 74
5. What is Q1?
a. 61
b. 63
c. 65
6. What is Q3?
a. 79
b. 80
c. 81
7. What is the inter-quartile range?
a. 14
b. 15
c. 16
8. How many values would be considered modes?
a. one
b. two
c. three
9. What is the mean?
a. 65
b. 72.368
c. 74
10. What is the sample variance?
a. 9.001
b. 27
c. 81.018
11. What is the sample standard deviation?
a. 9.001
b. 27
c. 81.018
12. Which best describes the shape of the distribution of running times?
a. linear
b. skewed
c. symmetric

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