Determine ux and sigma(x) from the given parameters of the population and sample size u = 76, sigma

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Determine ux and sigma(x) from the given parameters of the population and sample size
u = 76, sigma = 28, n = 49
ux = ?
sigma(x) = ?


u = ux = 76
sigma(x) = sigma/sqrt(n) so we have
28/sqrt(49) = 28/7 = 4