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(21) A population has a known mean= 357'. and standard deviatiun=20.'?. We are going to take repeated samples, with replacement, of size 28 from this
(21) A population has a known mean= 357'.\" and standard deviatiun=20.'?. We are going to take repeated samples, with replacement, of size 28 from this population. What is the probability that the sample mean, 1' , will be less than 347.025? (Express answer rounded to 4 decimal places.)
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