(Answered) 24 credit card holders are selected at random for each

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24 credit card holders are selected at random. For each, their current credit card balance is recorded. The average for these 24 people is = $600. Assume that the current balance of all credit card holders follows a normal distribution with unknown mean μ, and that a 85.3% confidence interval for μ is found to be $600 ± 33.1. Find the standard deviation σ of the population?

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