The stock market can have three potential returns with the following probabilities. Note "otherwise" is whatever probability it takes for all three probabilities to sum to one. So, if the first two probabilities are each .30, then "otherwise" represents a probability of .40.

Probability	Return
0.24	-0.04
0.38	0.00
otherwise	0.18

What is the stock market's standard deviation? Enter your answer in decimal form, and show 4 decimal places.