Asurvey of a group of seventh graders and a group of teachers at a local middle school asked how many siblings they each have. the dot plots below show the results. students a dot plot titled students. a number line going from 0 to 9 labeled number of siblings. there are 2 dots above 0, 4 above 1, 7 above 2, 5 above 3, 2 above 4, and 0 above 5, 6, 7, 8, and 9. teachers a dot plot titled teachers. a number line going from 0 to 9 labeled number of siblings. there is 1 dot above 0, 3 dots above 1, 2 above 2, 4 above 3, 5 above 4, 3 above 5, 1 above 6, 0 above 7, 1 above 8, and 0 above 9. what is closest to the difference between the means of the two dot plots? 0.5 1.0 1.5 2.0

The correct answer is:

1.5

Explanation:

Attached to this answer is the diagram of the box plot described in the question, and the means from the plot are calculated thus;

Students;    no. of siblings

student 0     2

student 1      4

student 2     7

student 3     5

student 4     2

Total             20

Mean no. of siblings = (total number of siblings) ÷ (total number of students)

Note that number of students here are the once that had at least one sibling, others without siblings are not used in the calculation, hence 5 students (student-0 to student-4) make up total number of students, while the remaining 4 students (student-4 to student-9) are disregarded.

Therefore, mean = 20 ÷ 5 = 4 siblings.

Teachers       No. of Siblings

student 0         1

student 1          3

student 2         2

student 3         4

student 4         5

student 5         3

student 6         1

student 8         1

Total                20

mean = (total number of siblings) ÷ (total number of students)

note that 8 students are used for the calculation, same reason as explained above

mean = 20 ÷ 8 = 2.5

Mean difference between the two plots = 4 - 2.5 = 1.5.

you probably know the answer. stop asking stupid questions and making me waste my time. j.k. ; )   b.t.w. what are three ratios equivalent to 5 : 11? thx

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