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Mathematics
Mathematics
Problem
The four observations
3
,
9
,
a
,
3, 9, a,
3
,
9
,
a
,
and
b
b
b
have arithmetic mean
6
6
6
and standard deviation
6
\sqrt{6}
6
. Determine the two possible pairs
(
a
,
b
)
(a, b)
(
a
,
b
)
.
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