Statistic question about adequate sampling

I have an xbar of 1000 and an Sx of 103. I have a random sample of 30. I am trying to figure out if this is an adequate sample without knowing the total population in an office. Can you lead me to a useable equation?

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Where:
N = Sample Size
σ = Standard Deviation
μ = Sample Mean
α = Level of Significance

Assuming you have a normal distribution, find in the t-Student table the value for the ...