If the Standard Deviation was 3 and the average was 52, between what 2 values would contain the middle 68%?

If the Standard Deviation was 3 and the average was 52, between what 2 values would contain the middle 68%?

A) between 52 and 58
B) between 49 and 55
C) between 48 and 56
D) between two ferns

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