How to find Sharpe Ratio? (Please explain calculations)

I was able to calculate the following:

Stock's expected return: 18%

Standard deviation: 24%

Coefficient of variation: 1.33

Assume the risk-free rate is 4%. Calculate the stock's expected return, standard deviation, coefficient of variation, and Sharpe ratio. Do not round intermediate calculations. Round your answers to two decimal places.

Demand for the Company's Products	Probability of This Demand Occurring	Rate of Return If This Demand Occurs
Weak	0.1	(28%)
Below Average	0.1	(14%)
Average	0.4	14
Above Average	0.3	34
Strong	0.1	60
	0.1