Question

A survey 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

Answer 1

Solution :-

from image we get,

→ Total number of students are = (4*2 + 3*5 + 2*7 + 1*4) = 8 + 15 + 14 + 4 = 41

so,

→ Mean = 41/20 = 2.05

and,

→ Total number of teacher are = (8*1 + 6*1 + 5*3 + 4*5 + 3*4 + 2 * 2 + 1 * 3) = 8 + 6 + 15 + 20 + 12 + 4 + 3 = 68

so,

→ Mean = 68/20 = 3.4

then,

→ Closest difference between mean of two dot plots = 3.4 - 2.05 = 1.35 ≈ 1.5 (Ans.)

Answer 2

Answer:

a,c,e

Step-by-step explanation:

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