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The mean is 82.2
The standard deviation is ≈ 9.8
So...the srcores that fall within one SD is
82.2 - 9.8 ≈ 72.4 and
62.2 + 9.8 ≈ 92
Note that 7 scores fall within this range = 7/10 = 70%
This is close to expected [ we expect 68%]
"C"