Standard Deviation of a Subset

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R = {223, 225, 227, 229, 231, 233, 235, 237}

Given Set R, Set S is formed such that it contains exactly 6 distinct numbers that are members of Set R. What is the standard deviation of the numbers in Set S?

(1) The average (arithmetic mean) of the numbers that are members of Set S is equal to the average of the numbers that are members of Set R.

(2) Set S does not contain 223.