The accompanying data file shows monthly stock prices (in $) for Corporation A and Corporation B over the past five years.

a-1. Calculate the mean and the standard deviation for Corporation A.

Note: Round final answers to 2 decimal places.

a-2. Calculate the mean and the standard deviation for Corporation B.

Note: Round final answers to 2 decimal places.

b. Which corporation had the higher average stock price over the time period? Which corporation's stock price had greater dispersion as measured by the standard deviation?

Date	A	B
1/1/14	42.41	31.31
2/1/14	47.35	32.19
3/1/14	46.10	33.29
4/1/14	42.37	33.05
5/1/14	41.96	33.05
6/1/14	43.06	35.91
7/1/14	39.91	35.63
8/1/14	39.82	36.54
9/1/14	40.98	35.67
10/1/14	42.31	34.29
11/1/14	45.18	38.04
12/1/14	40.69	37.86
1/1/15	44.66	40.30
2/1/15	42.91	43.40
3/1/15	44.00	44.58
4/1/15	47.94	46.62
5/1/15	50.71	48.59
6/1/15	51.12	50.07
7/1/15	51.74	54.39
8/1/15	48.55	52.41
9/1/15	45.99	54.30
10/1/15	40.35	59.79
11/1/15	41.24	57.08
12/1/15	41.36	56.44
1/1/16	37.69	57.11
2/1/16	44.38	54.72
3/1/16	44.57	56.49
4/1/16	45.03	53.07
5/1/16	41.45	52.20
6/1/16	41.49	54.33
7/1/16	44.37	55.58
8/1/16	47.21	53.84
9/1/16	51.40	50.96
10/1/16	46.25	51.10
11/1/16	53.32	54.71
12/1/16	50.43	53.53
1/1/17	49.82	52.79
2/1/17	54.36	54.17
3/1/17	53.38	57.00
4/1/17	55.73	58.49
5/1/17	57.10	60.98
6/1/17	54.96	56.64
7/1/17	51.48	52.23
8/1/17	50.56	53.92
9/1/17	53.17	52.41
10/1/17	58.46	53.36
11/1/17	58.49	57.13
12/1/17	63.75	56.05
1/1/18	64.42	54.65
2/1/18	59.74	56.39
3/1/18	60.12	57.05
4/1/18	60.11	56.69
5/1/18	64.88	56.09
6/1/18	69.53	47.96
7/1/18	69.09	52.75
8/1/18	72.30	53.52
9/1/18	74.25	57.07
10/1/18	72.71	58.81
11/1/18	74.86	65.53
12/1/18	65.99	63.89