Find the mean and standard deviation of sample

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Online shopping statistics are routinely reported by www.shop.org. In a random sample of 15 customers, the average monthly online expenditures is reported as $300 with a standard deviation $90. Suppose another 2 customers are added into this sample, their monthly online expenditures are $310 and $307 respectively. Find the mean and standard deviation of this sample with 17 customers.

Reference no: EM133265276

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