Correlation between online and retail sales

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A company sells bumper stickers through two channels: online and via retail locations (gas stations, car washes, etc.) across the country. Each month, online sales average 15k units with a standard deviation of 2k units. Total monthly retail sales (across all distributors) average 40k units with a standard deviation of 8k units.

The correlation between online and retail sales is 0.30. What is the standard deviation for total monthly sales (in units) across both channels?

Reference no: EM132202123

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