Problem 6-5 Expected Return: Discrete Distribution

A stock's return has the following distribution:

Demand for the Company's Products	Probability of This Demand Occurring			Rate of Return if This Demand Occurs (%)
Weak		0.1		-30%
Below average		0.2		-7
Average		0.4		11
Above average		0.2		35
Strong		0.1		55
		1.0

Calculate the standard deviation. Round your answer to two decimal places.