For the expression of standard error of mean, which formula is applicable
A. $$\frac{{\text{S}}}{{\sqrt {\text{n}} }}$$
B. $$\frac{{2{\text{S}}}}{{\sqrt {\text{n}} }}$$
C. $$\sqrt {\frac{{\text{S}}}{{\text{n}}}} $$
D. $$\frac{{\text{n}}}{{\sqrt {\text{S}} }}$$
Answer: Option A

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