Assume you want to determine whether the monthly movements in the Polish zloty against the dollar are more volatile than monthly movements in some other currencies against the dollar. The zloty was valued at $0.4616 on May 1, $0.4723 on June 1, $0.4876 on July 1, $0.4412 on August 1, and $0.4288 on September 1. Compute the standard deviation (a measure of volatility) of the zloty's monthly exchange rate movements. Do not round intermediate calculations. Round your answers to two decimal places. Negative values, if any, should be indicated by a minus sign.

First day in:	Value	Change
May	0.4616
June	0.4723	%
July	0.4876	%
August	0.4412	%
September	0.4288	%
	Std Dev	%