Practice Exercises for Introduction to Statistics

Directions: Read each question below. Click once in an ANSWER BOX and type in your answer; then click ENTER. After you click ENTER, a message will appear in the RESULTS BOX to indicate whether your answer is correct or incorrect. To start over, click CLEAR.

1. Twelve students were given a math test, and the times (in minutes) to complete it are listed below. Find the range of these times.

10,  9,  12,  11,  8,  15,  9,  7,  8,  6,  12,  10
 

ANSWER BOX:  min    

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2. A relay race was completed by 7 participants, and their race times are given below (in seconds). What is the range of race times?

13.2,  14.5,  12.9,  13.9,  15.6,  14.1,  12.3
 

ANSWER BOX:  s    

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3. What is the mean test score for the 6 scores listed below?

89,  93,  87,  86,  85,  94
 

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4. The average annual wind speed for the 5 windiest cities in the U.S. is given below in miles per hour. What is the mean of these annual wind speeds?

15.4,  14.0,  13.5,  13.1,  12.9
 

ANSWER BOX:  mph    

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5. What is the median age of the 7 children whose ages are listed below?

11,  10,  13,  11,  12,  16,  14
 

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6. The number of tornadoes that have occurred in the U.S. in the last 8 years is listed below. Find the median.

684,  764,  1133,  656,  702,  1303,  856,  1132
 

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7. Given below are the daily high temperatures for one winter week in Albany, New York. What is the mode of these temperatures?

39,  42,  34,  37,  39,  44,  41
 

ANSWER BOX:  °F    

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8. Find the mode of the following integers.

-18,  -13,  0,  +16,  +3,  -15,  0,  +11,  -14,  0,  +12
 

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9. Heather's test scores are 81,  93,  74  and 95. What score must she get on the fifth test in order to get a mean of 85 on all five tests? 
 
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10.  The mean of a set of numbers is 108. The sum of the numbers is 2,052. How many numbers are in the set?
 
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