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Please explain how do you calculate a moving average?

To calculate a 10-day moving average, first add the closing prices for days 1 to 10 and divide that total by 10. Then add the closing prices for days 2 to 11 and divide that total by 10. Thereafter, calculate the moving average value in the same way from the last ten closing prices. This gives us an average price for a moving period of the last ten days.

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