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A population has a standard deviation σ of 23 units. (Give your answers correct to two...

A population has a standard deviation σ of 23 units. (Give your answers correct to two decimal places.)

(a) Find the standard error for the mean if n = 24.

(b) Find the standard error for the mean if n = 41.

(c) Find the standard error for the mean if n = 77.

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