the prices of Stock A

1. Using the adjusted close, calculate the ex-post returns for stock A for each period.
2. Calculated the arithmetic mean for stock A.
3. Calculate the geometric mean for stock A.
4. Calculate the standard deviation or the risk associated with stock A.

Adj Dividend High Close Volume Date Open Low Close* 01-Jul-18 62.50 62.50 61.35 61.75 61.75 0.625 27,454,900 61.32 61.28 35,919,800 01-Jun-18 62.90 64.35 61.90 01-May-18 63.37 64.69 62.09 31,563,300 61.33 62.71 63.38 28,179,500 01-Apr-18 61.61 64.40 60.78 62.75 0.625 61.37 62.80 60.54 43,585,500 01-Mar-18 61.41 60.15 01-Feb-18 60.35 61.55 62.88 61.06 59.85 34,410,600 01-Jan-18 60.83 65.24 60.28 61.39 60.17 1.130 30,801,200 01-Dec-17 60.54 61.00 62.84 58.12 58.25 35,638,500 01-Nov-17 60.91 61.73 57.36 60.33 58.05 58,022,600 63.00 60.72 58.42 01-Oct-17 62.52 60.11 0.565 21,743,700 01-Sep-17 59.51 63.41 58.98 62.31 59.41 0.565 30,764,200 01-Aug-17 59.47 60.09 62.44 58.76 56.17 30,263,900 01-Jul-17 59.06 61.44 58.15 60.54 57.18 43,506,900