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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"