Find the Mean (Arithmetic) 12 , 15 , 9 , 5 , 17 , 16 , 10 , 11 , 4 , 8 , 9 , 20 , 12

Math
12 , 15 , 9 , 5 , 17 , 16 , 10 , 11 , 4 , 8 , 9 , 20 , 12
The mean of a set of numbers is the sum divided by the number of terms.
12+15+9+5+17+16+10+11+4+8+9+20+1213
Simplify the numerator.
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Add 12 and 15.
27+9+5+17+16+10+11+4+8+9+20+1213
Add 27 and 9.
36+5+17+16+10+11+4+8+9+20+1213
Add 36 and 5.
41+17+16+10+11+4+8+9+20+1213
Add 41 and 17.
58+16+10+11+4+8+9+20+1213
Add 58 and 16.
74+10+11+4+8+9+20+1213
Add 74 and 10.
84+11+4+8+9+20+1213
Add 84 and 11.
95+4+8+9+20+1213
Add 95 and 4.
99+8+9+20+1213
Add 99 and 8.
107+9+20+1213
Add 107 and 9.
116+20+1213
Add 116 and 20.
136+1213
Add 136 and 12.
14813
14813
Divide.
11.38461538
The mean should be rounded to one more decimal place than the original data. If the original data were mixed, round to one decimal place more than the least precise.
11.4
Find the Mean (Arithmetic) 12 , 15 , 9 , 5 , 17 , 16 , 10 , 11 , 4 , 8 , 9 , 20 , 12

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