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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"