Question: (d) If the standard deviation of a random variable X is 20 and a random sample of size nequals15 is obtained, what is the standard

(d) If the standard deviation of a random variable X is 20 and a random sample of size nequals15 is obtained, what is the standard deviation of the sampling distribution of the sample mean? sigma Subscript x overbarequals enter your response here (Type an exact answer, using radicals as needed.)

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