Bits and Pieces 1 Unit Test

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                                         Unit 3 Review
                                       (Chapters 2 & 13)

Remember, these are just examples of some of the skills you need to know for the unit test. It is
important to review your class work and homework, in addition to this review, to adequately
prepare for the test.

A group of 9 students has these numbers of children in their families: 3,2,4,2,1,5,1,2, and 7.

1.     Find the median number of children in the 9 families. Explain or show your work.




2.     Find the mean number of children in the 9 families. Explain or show your work.




For questions 3 and 4, the stem plot below shows test scores for Ms. McIntyre’s class on a state
mathematics test. Students could score from 0 to 100 points.
                                                                          Class Test Scores

                                                                           0   5
                                                                           1
                                                                           2   4
                                                                           3   4   9
                                                                           4   3   7   8
                                                                           5   7   9
                                                                           6   1   6   8
                                                                           7   3   5   6    8    8
                                                                           8   1   2   2    2    5
                                                                           9   0   3   9



3.     What is the range of the data? Explain or show your work.



4.     What is the median of the data? Explain how you found the median.
Use the line plot below to answer questions 5 through 8. This distribution describes the number
   of letters in the group’s first names.

             Lengths of Last Names



                   X
                   X X
                   X X X
                   X X X X
                 3 4 5 6 7 8



5.     Identify the mode. Explain or show your work.




6.     Find the median. Explain or show your work.




7.     What is the range? Explain or show your work.




8.     How many people are in this group? Explain or show your work.
For question 9, Earl rolls 6 six-sided number cubes and finds the sum of the numbers rolled.

   9.      Earl rolled the number cubes several times and recorded each sum. Here are Earl’s
           results:
               27, 21, 17, 18, 21, 18, 25, 32, 8, 19, 21, 20, 26, 21, 11, 23, 33, 19, 9, 12, 17

          Make a stem-and-leaf plot to display Earl’s data.




   10.     Make a double bar graph of the data.
             Major Indoor Soccer League
   Team                          Wins                Losses
   Detroit                       13                  27
   Kansas City                   14                  26
   Milwaukee                     24                  16
   Toronto                       21                  19
   Wichita                       18                  21
11.      A group of people voted for their favorite season. The results are shown in the circle
         graph.

                           Winter 10
             Fall 10       10



                             Spring 20


               Summer 60




      Predict how many people out of 300 you would expect to choose spring as their favorite
      season.




12.       Tom went to the mall to buy a shirt for his friend. His choices for the shirt are short
         sleeves or long sleeves. Both choices come in black, white, blue, and green. Create a
         tree diagram to find all possible outcomes.




13.       A box contains seven tiles numbered 1 through 7. You randomly choose a tile.
         What is the probability that you choose a number greater than 3? Tell whether the
         event is impossible, unlikely, likely, or certain.

				
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