1)
n = 4
=
= (1 + 4 + 6 + 1) / 4
= 12 / 4
= 3
SS = (x
-
)2
= (1 - 3)2 + (4 - 3)2 + (6- 3)2 + (1 - 3)2
= 4 + 1 + 9 + 4
= 18
SS = 18
Option b: 18
2)
n = 5
=
= (1 + 3 + 7 + 4 + 5) / 5 = 20 / 5 = 4
=
(x
-
)2 / n
= (1 -
4)2 + (3 - 4)2 + (7-
4)2 + (4 - 4)2 + (5 -
4)2 / 5
= 9 + 1 + 9 + 1 /
5
= 20 / 5
= 4
Standard deviation = 2
Option d: 2
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