A random sample of size $n$ is to be drawn from a population with $\mu = 1200$ and $\sigma = 200$. What size sample would be necessary in order to reduce the standard error to 25 ?

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The Answer of A random sample of size $n$ is to be drawn from a population with $\mu = 1200$ and $\sigma = 200$. What size sample would be necessary in order to reduce the standard error to 25 ?

A Random Sample of Size nnn Is to Be Drawn from a Population With

A Random Sample of Size $n$ Is to Be Drawn from a Population With