Your neighborhood gym tracked how many days each of its members worked out over the past week. Let G = the number of days per week a member worked out. A 2-column table with 8 rows. Column 1 is labeled number of days with entries 0, 1, 2, 3, 4, 5, 6, 7. Column 2 is labeled probability with entries 0.49, 0.12, 0.13, 0.15, 0.06, 0.02, 0.02, 0.01.

Calculate the standard deviation of G.

A. 1.6764 days
B. 2.2913 days
C. 2.8104 days
D. 5.25 days