math 3 15
3
4
2
2
σ
2
3
4
2
2
X
σ
2
X
3
4
2
2
median
3
4
2
2
3
4
2
2
mode
3
4
2
2
3
6
4
2
2
5
⟨
6
4
2
2
5
3
⟩
mean
3
p
X
⟨
X
3
⟩
p
3
p
X
moment
3
p
X
x
y
3
7
(
x
+
y
3
7
)
x
+
y
3
7
i
j
i
1
5
j
5
9
i
j
[
m
i
,
j
|
m
i
,
j
=
i
j
;
i
∈
1
5
∧
j
∈
5
9
]
A
det
A
A
A
T
V
1
V
1
1
2
3
4
1
1
2
(
1
2
3
4
)
1
=
(
1
2
)
A
B
a
b
θ
N
A
×
B
=
a
b
sin
θ
N
A
B
a
b
θ
A
.
B
=
a
b
cos
θ
A
B
A
⊗
B
42
42
∈
Z
44.997
44.997
∈
R
22
7
22
/
7
∈
Q
1729
1729
∈
N
17
29
17
+
29
i
∈
C
17
17
∈
P
1
ln
e
=
1