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 
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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.