Calculate confidence interval for the mean

Reference no: EM13122305

55 credit card holders are selected at random. for each their current credit card balance is recorded. the average for these 55 people is xbar = $700. assume that the current balance of all credit card holders follows a normal distribution with unknown mean and known standard deviation of $90. what is the 99% confidence interval for the mean?

Reference no: EM13122305

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