Using the historical returns below, calculate the Sharpe Ratio for each of the stocks. Which stock has the best risk-return trade-off based on the Sharpe Ratio?

	SP500	KO	XOM	GM	VZ	NVDA	rf
Total Holding Period Return	0.837657	0.505198	-0.327224	0.479444	0.587265	15.190752	0.055022
Mean	0.011152	0.007812	-0.003564	0.010877	0.008888	0.055342	0.000893
Standard Deviation	0.044003	0.043788	0.077130	0.093355	0.048517	0.128125	0.000700