SOLUTION: Number of cavities- In a dental survey of third-grade students, this distribution was obtained for the number of cavities found. Find the average number of cavities for the class.

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Question 573822: Number of cavities- In a dental survey of third-grade students, this distribution was obtained for the number of cavities found. Find the average number of cavities for the class. Use the weighted mean.
Number of students
12
8
5
5
Number of cavities
0
1
2
3
Answer by stanbon(75887) About Me  (Show Source):
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Number of cavities- In a dental survey of third-grade students, this distribution was obtained for the number of cavities found. Find the average number of cavities for the class. Use the weighted mean.
Number of students
12
8
5
5
Number of cavities
0
1
2
3
----
weighted mean = (12*0+8*1+5*2+5*3]/30 = (8+10+15)/30 = 33/30 = 1.3
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Cheers,
Stan H.