# QNT/351 Standard deviation

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The confidence interval generally provides a range that the mean of the population would fall in to. For example if we wanted to know the average account balance of customers that have multi-line accounts we can take a small sample.

Let's say that we sample 100 customers and find the average account balance to be \$5,435. The standard deviation is \$365.78. Class, what is the confidence interval?

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