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Find the Mean 4 , 8 , 6 , 7 , 15 , 12 , 11 , 10 , 8 , 4 , 6 , 9 , 12 , 12 , 15 , 15 , 18 , 16 , 8 , 12 , 15 , 4 , 9 , 12
4
,
8
,
6
,
7
,
15
,
12
,
11
,
10
,
8
,
4
,
6
,
9
,
12
,
12
,
15
,
15
,
18
,
16
,
8
,
12
,
15
,
4
,
9
,
12
Step 1
The
mean
of a
set
of numbers is the
sum
divided by the number of
terms
.
4
+
8
+
6
+
7
+
15
+
12
+
11
+
10
+
8
+
4
+
6
+
9
+
12
+
12
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Step 2
Simplify the
numerator
.
Add
4
and
8
.
12
+
6
+
7
+
15
+
12
+
11
+
10
+
8
+
4
+
6
+
9
+
12
+
12
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
12
and
6
.
18
+
7
+
15
+
12
+
11
+
10
+
8
+
4
+
6
+
9
+
12
+
12
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
18
and
7
.
25
+
15
+
12
+
11
+
10
+
8
+
4
+
6
+
9
+
12
+
12
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
25
and
15
.
40
+
12
+
11
+
10
+
8
+
4
+
6
+
9
+
12
+
12
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
40
and
12
.
52
+
11
+
10
+
8
+
4
+
6
+
9
+
12
+
12
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
52
and
11
.
63
+
10
+
8
+
4
+
6
+
9
+
12
+
12
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
63
and
10
.
73
+
8
+
4
+
6
+
9
+
12
+
12
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
73
and
8
.
81
+
4
+
6
+
9
+
12
+
12
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
81
and
4
.
85
+
6
+
9
+
12
+
12
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
85
and
6
.
91
+
9
+
12
+
12
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
91
and
9
.
100
+
12
+
12
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
100
and
12
.
112
+
12
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
112
and
12
.
124
+
15
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
124
and
15
.
139
+
15
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
139
and
15
.
154
+
18
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
154
and
18
.
172
+
16
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
172
and
16
.
188
+
8
+
12
+
15
+
4
+
9
+
12
24
Add
188
and
8
.
196
+
12
+
15
+
4
+
9
+
12
24
Add
196
and
12
.
208
+
15
+
4
+
9
+
12
24
Add
208
and
15
.
223
+
4
+
9
+
12
24
Add
223
and
4
.
227
+
9
+
12
24
Add
227
and
9
.
236
+
12
24
Add
236
and
12
.
248
24
248
24
Step 3
Cancel the
common factor
of
248
and
24
.
Factor
8
out of
248
.
8
(
31
)
24
Cancel the
common factors
.
Factor
8
out of
24
.
8
⋅
31
8
⋅
3
Cancel the
common factor
.
8
⋅
31
8
⋅
3
Rewrite the
expression
.
31
3
31
3
31
3
Step 4
Divide
.
10.
‾
3
Step 5
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.
10.3
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