Which of the following is true about daily exchange rate moves?

The frequency of six standard deviation daily movements in an exchange rate is about once every 13 years

The frequency of six standard deviation daily movements in an exchange rate is about once every 100 years

Four standard deviation daily movements in an exchange rate happen more frequently than three standard deviation moves in the exchange rate

Four standard deviation daily moves in an exchange rate happen less frequently than they would do if changes were normally distributed

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