Use clustering to estimate the group of numbers: 9.8 + 10.1 + 11.5 + 9.2 + 9.1
A. 45
B. 55
C. 40
D. 50
We can estimate it to be 10 + 10 + 12 + 9 + 9 which equals 50, so the answer is D.
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+1982 
+1253 
