Add a column in your spreadsheet with the monthly return to an equally weighted portfolio of 12 stocks. Compute the mean and standard deviation of the monthly returns of this p

Date	Adjusted Closing Prices for the 12 stocks
	AXP	AAPL	BA	GS	IBM	JNJ	MCD	MSFT	VZ	V	WMT	DIS
1/1/2012	43.49178	13.9979	60.69836	96.05989	136.3321	65.91	75.42535	23.99138	24.31175	23.499	48.91045	34.82887
2/1/2012	46.04844	16.63385	61.3284	99.22254	139.2555	65.08	75.60049	25.78688	24.92225	27.17189	47.09305	37.59549
3/1/2012	50.37555	18.38512	61.21199	107.5002	148.2682	65.96	75.22663	26.38189	25.00073	27.60519	48.78292	39.19815
4/1/2012	52.42157	17.90767	63.21205	99.53088	147.1526	65.1	74.7282	26.18562	26.40672	28.77022	47.27185	38.59827
5/1/2012	48.77631	17.71602	57.29417	82.71909	137.0761	62.43	68.50913	23.87128	27.59005	26.95015	52.81673	40.92616
6/1/2012	50.85561	17.90829	61.51334	83.25344	139.5628	67.56	68.4195	25.18033	29.44528	28.97696	56.3259	43.42417